A hidden hot spring hike beats the usual tours. This day trek pairs Hengill geothermal terrain with a hands-on orienteering lesson, then ends with a real soak at a natural hot spring, all within an hour of Reykjavik and near the Thingvellir UNESCO area.

I like the way the guide teaches orienteering with a compass and altimeter, turning the hike into more than just exercise. I also like the small group size (12 max), which means the pace and instruction feel personal instead of assembly-line.

One thing to consider up front: this is a challenging day hike, listed around 17 km with about 1,010 m of elevation gain, so you need solid fitness. And weather in Iceland can change fast, so pack for wind, rain, and cold if you want to stay comfortable.

Key highlights you’ll feel on this Hengill trek

• Orienteering in real wild terrain, guided with a compass and altimeter (not just a classroom talk)
• Small-group pacing with a maximum of 12 people, so you can ask questions and adjust fast
• Hard-working hike, about 17 km with significant elevation gain, plus a summit section aimed at views
• Natural hot spring included, so you can swap effort for recovery
• Short Thingvellir UNESCO area stop, with the listed admission marked free for that stop

A hard day hike with real rewards at Hengill

If your idea of a great Iceland day is physical effort plus a payoff, this Hengill trek is built for you. You are looking at roughly a 9-hour day, and the route is described as challenging. The numbers are clear enough to plan around: 17 km (about 10.5 miles) and about 1,010 m (3,314 ft) of elevation gain. That is not a stroll, even if the views look friendly.

The pace also matters. This kind of hike usually means steady climbs, stops for navigation practice, and time to reach the hot spring when the group is ready. The good part is that the day is not just “walk until tired.” You get an orienteering lesson, then you use what you learn while moving through wild terrain.

The practical tip here is simple: go in with a realistic stamina plan. If you tend to overdo the first hour, you might feel it later when the cold air and wind show up. I would plan snacks and hydration carefully, because lunch and water are not included.

Getting from Reykjavik to the trailhead near Nesjavallaleid

The start is easy to understand and not too far. You travel about 50 minutes from Reykjavik city center to the meeting area near the start of a trail along Nesjavallaleid. The meeting point is a parking lot, and the exact coordinates are provided for the experience.

Timing is something you should respect. The start time is 10:00 am, and you are asked to meet about 15 minutes early. That early arrival helps you settle in, meet the guide, and get ready before the day begins. In Iceland, a late start can quickly turn into rushing, which is exactly what you do not want on a navigation-focused hike.

Also note the ticket method. This uses a mobile ticket, so have your phone charged and ready. It is a small detail, but it saves stress when you are standing outside in the cold waiting for your group to be checked in.

Your short Thingvellir stop: a UNESCO taste without the crowds

This trip is not designed as a full day inside Thingvellir National Park. Instead, you get a short stop at the foot area connected to Thingvellir, described as a UNESCO World Heritage Site. The time is listed as about 15 minutes, and the admission for that stop is marked free.

What this means for you: you get the feeling of being near a place with strong Iceland identity, without spending your whole day on one fenced-off loop. It is a smart choice if you want variety, especially because the rest of your day shifts to Hengill geothermal terrain and navigation practice.

One drawback is that if you want a long, guided walk deep in the park itself, this probably will not satisfy that craving. But if you like the idea of a quick UNESCO context and then getting onto rough ground with a guide, this pacing fits well.

Orienteering with compass and altimeter, taught by the mountain leader

The most distinctive part of this experience is the orienteering lesson. It is included, and the guide is described as an International Mountain Leader, with licensed and certified local guides also involved. That matters because navigation in Iceland is not just about knowing directions. Conditions can be slippery, visibility can shift, and routes can feel less obvious than they look on a map.

The lesson includes learning to navigate using a compass and altimeter. You are not expected to already be good at it. The value is that you get taught how to apply basic tools while moving through wild terrain, rather than only learning theory before a hike.

How to make this instruction stick:

• Ask questions early, before the terrain starts to feel complex.
• Pay attention to how the guide expects you to use the compass and altimeter as you gain elevation.
• Stay present during stops, because the point is to build confidence while you still have the guide right there.

If you like “skills you can reuse,” this is a big reason to book. A hot spring soak is great, but navigation training is what turns a one-day trip into something you can carry home.

Hengill climbing and the summit view payoff you plan for

Once the hike is underway, the day is about moving from lower ground up toward viewpoints. The route includes a summit section described as about 450 m (1,480 ft) elevation rise toward wide panoramas. The bigger elevation gain number is listed overall, so expect climbing that feels cumulative.

The day is described as changing scenery, from rugged cliffs to more tranquil valleys. That matters because it breaks up mental fatigue. A long climb with identical scenery can make you feel slower than you are. When the terrain shifts, you start reading the land differently, and that makes the climb feel more like a journey than a grind.

You are also told the trek includes a playful search theme, like looking for lost treasures in the open wilderness. I like that approach because it keeps motivation high during navigation practice. It is hard to keep focus when it is windy and your legs are burning, so having a goal beyond just getting to the end helps a lot.

One realistic consideration: this is described as challenging, and the terrain plus elevation can be demanding. If you are not comfortable hiking on uneven ground for hours, you might find the day heavy.

The Lost Hot Spring soak, and why your timing matters

The hot spring is included. That is the end reward the day is built around: hike hard, then unwind in natural geothermal waters. The experience specifically asks you to pack a swimsuit and towel, and that is not optional advice.

Here is what to plan for so you enjoy the soak instead of tolerating it:

• Bring quick-dry layers you can get back into fast after soaking.
• Keep your towel accessible, since you likely will not want to dig through your pack mid-process.
• Plan to pace yourself before the hot spring. If you sprint the last climb, you might feel shaky or chilled afterward.

Weather can change rapidly in Iceland, so the soak can feel wonderfully warm, but the time before and after can still be cold and windy. The experience also mentions you should be prepared with the right gear, including waterproof layers, cap, and gloves, so you do not end up soaked in rain instead of in geothermal water.

This is also where the trip feels different from typical day tours. Many tours take you somewhere scenic and move on. Here, you physically recover at the destination, which makes the whole day feel complete.

What you get included, and what you must bring to stay comfortable

The included items are straightforward and worth checking against your packing list:

• Orienteering lesson
• Licensed and certified local guides plus an International Mountain Leader
• Hot spring (included)
• All fees and taxes

What is not included is where you can avoid problems by planning early:

• Lunch, snacks, and bottled water are not included
• Hiking shoes are not included
• Swimsuit and towel are not included
• Waterproof jacket and pants, cap, and gloves are not included
• Spare t-shirt is not included

My practical advice: treat this as a gear day. Iceland can be wet, and you are on a challenging hike. Good shoes matter, not just for comfort but for safety on uneven ground. Waterproof pants and jacket will help you stay warm and keep your movements steady.

Swimsuit and towel are easy to forget because the day is about hiking first. Set them out the night before so you do not end up improvising. Since bottled water is not included, bring enough to cover a long day. Even if the guide keeps you on schedule, you still need your own hydration plan.

Also, bring layers you can breathe in during climbs. If you overheat early and then cool down fast, that is how people get miserable mid-day in cold wind.

Price and logistics: where the $180.14 per person feels fair

This experience costs $180.14 per person for about 9 hours. That price is not just paying for a hike plus a hot spring. You are also paying for instruction and leadership: an orienteering lesson plus an International Mountain Leader, plus licensed local guidance.

To judge value, look at what would cost you otherwise:

• Hot spring time is included, so you do not have to figure out access and costs on your own.
• Navigation training is included. Guide-led skill sessions are rarely cheap, especially when the day is physically demanding and the conditions can be unpredictable.
• Small-group format (up to 12) typically increases costs, but it also improves your day. You are less likely to feel ignored.

The biggest “value tax” is that you still have to cover your own basics like lunch and snacks. If you show up unprepared, you pay extra later. If you pack well, the price starts to feel more reasonable for what you are getting: a guided skill day with a hot spring recovery at the end.

Who this trek suits best in Reykjavik

This tour has an age requirement of 16+ and is described as for travelers with strong physical fitness. If you know you can handle a tough day of hiking, you will likely enjoy it.

I think it is especially good if you want something less tour-bus and more hands-on. One solo woman shared that she liked that it felt non-typical and active, which is exactly what this day is aiming for. With a small group and strong guide support, solo travelers can feel comfortable choosing a structured, skill-based outing instead of a DIY route.

It also fits well if you like learning outdoors. Not everyone wants to just take photos. Learning how to navigate with a compass and altimeter gives you a different kind of memory from Iceland, tied to how you moved through the terrain.

When you should skip it (so you do not force it)

Be honest about what challenging means for you. If 17 km with steep elevation gain would push your limits, you might want to choose a gentler Iceland hike.

Also consider weather sensitivity. The experience notes that weather can change rapidly and you should be prepared for all conditions. If you cannot wear waterproof gear or you do not feel confident hiking in wind and wet ground, you might find the day stressful rather than fun.

Lastly, you should be ready for a full day. At around 9 hours, this is not a quick break from Reykjavik sightseeing. Plan other activities accordingly, and do not schedule anything demanding right after.

Should you book this Hengill Lost Hot Spring trek?

I would book if you want three things in one day: a challenging hike near Hengill, a practical orienteering lesson with compass and altimeter coaching, and a natural hot spring included to end it right. The small group size helps you feel guided, not herded, and the hot spring payoff makes the effort feel earned.

I would skip it if you want an easy walk, if you dislike cold and wet conditions, or if you are missing the basics like good hiking shoes and waterproof layers. This is a day where preparation turns a good trip into a great one.

If you are ready for a real trek and like the idea of learning outdoor navigation, this is a strong pick for an Iceland day that feels active and personal, with relaxation at the finish.

FAQ

How long is the day trek to Hengill and the Lost Hot Spring?

It lasts about 9 hours.

How difficult is the hike?

It is described as challenging, with a length of about 17 km and elevation gain listed at about 1,010 m.

What age is the experience for?

All participants must be over 16 years old.

What is included in the price?

The price includes the orienteering lesson, licensed local guides plus an International Mountain Leader, the hot spring, and all fees and taxes.

What is not included, so I need to plan for it?

Lunch, snacks, bottled water, hiking shoes, swimsuit and towel, waterproof jacket and pants, cap and gloves, and a spare t-shirt are not included.

Where do we meet?

You meet at the designated starting point near Nesjavallaleid, at a parking lot along the road. The exact start location is provided.

How big are the groups?

Group sizes are kept small, with a maximum of 12 travelers.

What happens if weather is bad?

The experience requires good weather. If it is canceled due to poor weather, you will be offered a different date or a full refund.