Nothing. In fact, I don’t think anyone could pay me enough to make me go to the moon.
The bottom of the ocean however? I think if the opportunity ever presented itself, I would very much consider going to the bottom of the ocean. The moon – in my opinion anyway – holds very few secrets, whereas I think there are hundreds (if not thousands of thousands) secrets still to be discovered on our own planet. I personally would find those far more enticing than a big rock in the sky.
I also really don’t like heights. So that is also a very big factor. I like to remain as close to the ground as possible.