Number one for sure would be to fly like Superman, That has always been my dream. I'm a Halo fan, so of course I'd want to play through some of the Halo Games as a Spartan. I also think that the Spirit of Fire from Halo Wars is one of the coolest spaceships of any movie or game ever, so I'd want to create a version of that (w/the AI Serena, because I love how sarcastic she is) and explore the galaxy. I also love Rivendale from Lord of the Rings, so I'd probably spend a lot of my kick-back time there. I'm sure I'd have sex with Arwen a few times, and maybe even take some other celebrity crushes and make them into elves and have sex with them too, but I have a feeling sex with a virtual character will turn out to be very empty and meaningless and that it won't be as popular as some people expect. I'm not a huge Star Wars fan, but who could resist being a Jedi knight? Although actually, being able to shoot lightning out of my fingers seems pretty damn awesome so maybe I'd be a Sith instead and conquer the galaxy. Of course I'd watch all of the Super Bowls from the sideline, watch some of the best concerts of all time from the front, etc.
But I think more than anything else, I'd travel the world. I'd visit all of the major destinations in the present time, then begin exploring the world in the past. I'd go to Disneyland on opening day, visit ancient Rome, Greece, Persia, and China. Witness the birth of Christ. Travel back to the age of the dinosaurs and hunt a T-Rex. Sail on the Titanic. Watch the liftoff of Apollo 11.