I find being naked in just about any venue is always fun, and exciting. I've particularly enjoyed non-technical mountain climbing above timberline. Never have done it on one of the fourteeners as they're always packed with people but there are any number of 13,000+ peaks where you can be the only one on the mountain and there's something about sumitting a peak well above timberline in nothing but your shoes that is always a thrill. I've also enjoyed jogging wilderness trails, canoeing, driving the open road and flying my airplane while naked.