Want to get away from it all? Very away from it all? It’s never too early to start planning your vacation—especially since it might take you a few years to travel to reach some of the solar system’s best spots. Still, the long trip is well worth it for the spectacular swimming, boating, and sunbathing opportunities unlike anything you’ve ever seen on this green Earth. Just be warned: Survival before, during, and after activities is not necessarily guaranteed.