Turn a small courtyard into a sanctuary by adding an outdoor hot tub! Fun view of spa pool from above. I would have a hot tub like this! It's private and looks so nice rather than those ugly big plastic things.
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.