A big sauna with a huge window looking out on the forest and the outdoor hot tub that's big enough for many people to warm up from the cold. This could also be used as a cold pool for dunking after sweating in the sauna.
Find a great selection of DIY Sauna Kits at Cedar Barrel Saunas. All of our indoor and outdoor DIY sauna kits are ready-to-install and ready-to-assemble and come with surgical Stainless Steel sauna heater.
Just add Himalayan salt brick instead of stone and make it traditional Finnish sauna
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The Boulder Sauna [design]—How to Build a Finnish Sauna: cedar, kits, heaters…