Strútslaug is little known geothermal hot pool in the Highlands. You can make a visit here alongside a trip to Markarfljótsgljúfur Canyon, Mælifell or after visiting Landmannalaugar (though the drive is quite long). The trail to get here begins at Strútur Hut.

Safety concerns: the roads leading to this place can be challenging and include multiple river crossings. They are F-Roads which are not accessible outside of the summer season. To drive on F-Roads you must have a 4x4. Be sure to check road conditions and closures at road.is. Please be careful and make sure you have experience crossing rivers and do not take excessive risk. Not all car companies cover damage to cars in river-crossings and it can be easy to get stuck.

If you want to play it safe and be in a well-equipped, photogenic car, then you should rent an old-school Land Rover Defender from www.isak.is equipped with a snorkel. This helps ensure you don't drown the engine while crossing a river. Use the code "gunnar" for renting your Defender on a special price. 

Tips on river crossings: https://epiciceland.net/icelandic-rivers-how-to-cross/. Make sure to go with the stream (diagonal across the river in the direction of the flow). Do not drive against the stream, but let the flow of the river help you cross.

Note that crossing Hólmsá close by can be challenging and finding the correct crossing can be a bit confusing. If in doubt, wait for another 4x4 to cross and follow their lead. Additionally, there is very little cell-phone reception in this area, so it's not a fun place to get stuck!