Best life I could imagine. touring the world in a band with your significant other by you.
Best. job. ever.
Followed by touring the world with a band without your significant other. Groupies are what being a rock star is all (or partly) about.
If I had the talent, I would love to be a professional athlete. Make a crap load of money, have tons of fun playing the sport you love, and arguably you'll be less in the limelight than other celebrities (musicians, actors). I would want to be either a professional footballer (for the chance to travel the world as I'm transferred from marquee club to marquee club, and to play in the World Cup (unfortunately not Euros, but hey, if we're dreaming here, then I'm a German footballer), or an NHL player.