In the back of a pickup truck with a clear sky and lots of stars under some warm blankets... in a tent...on the lake in a nice boat...on a moonlit beach (with a sheet under u of course. Gadda keep the sand out) and um.... in the woods. Yep. I think that's about it.
Seriously though, the most exciting place is a public bath house when everyones gone. For those who are not familiar with the traditional Japanese bath house, the baths generaly display some mountain vista on the walls, when the overhead lights go off and only the bath lights illuminate the environment, magic is in the air, and in the water.