I'd either join the 3rd Street saints becuase they saved my life, and kill anyone not wearing purple
or
I'd pick the Red Shell Kart as my vehicle, and the red koopa as my partner, and hop into the all cup tour to just dominate everyone year in and year out. Eventualy I'd retire as the winningest Double Dash racer in the mushroom kingdom, and become a tv personality on the Kingdom's number one sports show. Soon after I would be inducted into the Double Dash Hall of Fame, and be placed as #1 on just about every episode of "Double Dash: Top Ten"
or
Wake up on the Endar Spire as a smuggler hired by the Republic just before the Endar Spire just before take off,barely make it off the ship and become a jedi. I'd lead a loveable crew of characters around the galaxy and try to stop the Sith. I would also regret that I couldn't save Trask Ulgo from certain death on the Endar Spire