go to florida, wait for the next spaceshuttle heading for the moon (be carefull sometimes they dont stop there) remember to wear good clothes and funny helmet I dont think you need special passport/visa

...get drunk and swim in the ocean...

With the space shuttles decommissioned, there will be more opportunities for private corporations to build spacecraft. Either wait until one of them starts offering tourist tix to the moon, or train as an astronaut and go on a mission there. One thing I need to warn you about: I have been told that in zero-G, the otoliths in our ears float free and cause a constant seasick feeling.