Hmm. I'd want to see a lot of things. I'd like to see Mount Everest. I'd like to go to Yellowstone. I'd like to see the Cherry trees blossom in Japan. I would especially love to see a Muse concert. 8D I can't really choose one.... :/
First, I'd go buy a good telescope. Then, I'd go far away from civilization, so the lights and everything won't blot out the stars. Once out in the country, I'd stargaze my heart out. That would be cool. For me. :P