Immense: I tried rock climbing a time or two. It's hard work and a bit scary to be clinging to a cliff side trusting only your hands, feet, belay, and rope. Instead, when at the park, I like to scramble on boulders. It's fun to try to find a way up the side of a rock formation, looking for footholds, making my way up the crack between a pair of rocks, leaping from boulder to boulder, then climbing back down, often sliding on my backside.
After I scramble to the top of a rock formation and look down 20 or 30 feet, my heart pounds, my palms scraped from the pebbly monzogranite stone. I gaze at the azure sky and feel overwhelmed by the surrounding landscape, by the length of the horizon that curves under distant dark mountains. Each time I think, Wow. This is awesome, as if I've just climbed Everest. I never grow tired of that feeling or of looking out at the splendid view and all that beautiful, uncluttered space.