Me personaly, i'd love to visit saturn, and see the giant ring and everything. What's your choice?????
EDIT: I know the gas planets are made of gas, but lets just say the traveler made them livable. And i know pluto is a planet. I'm making fun of all the teachers who tell us it's not anymore
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Saturn would be awesome, even though it's mainly gas. Of course The Traveler changed a lot of stuff, so the possibilities are endless. Saturn would be perfect to add in a lot of jumping areas and a lot of bottomless pits. This will give it the sense of still not being fully solid, but still able to explore it.