(facepalm)... Ughh I completely forgot about Pokemon. That really would be so much fun, catching all these wild animals. Hopping on a Wailord and sailing across the ocean.
I would have to say Resident Evil. As long as I knew I wouldn't die, that would be so awesome just to run around shooting zombies. Other than that, the obvious choice would be Zelda: Wind Waker. I love the ocean, and I love Zelda, plus I think it would be awesome to sail to and experience all...