But yeah, space is tons cooler than any of the other things you listed.
I also fancied underwater exploration, as well -- I think there are more mysteries in the deep than in space. I just love to imagine all the lifeforms that may live in the Earth's core. Fascinating, indeed.
But perhaps I should just write a story about it, because I don't want to be disappointed when reality uncovers the less-than-satisfying truth.