Damn !
I know what you mean! I have an interest (nay passion) for cricket, but where does a 35 year old go to brush up on (nay learn ;-)) spin-bowling ? I did do cricket at school, so I would've payed more attention, perhaps taken it up with one of the team that used to play on the local park.
ho well, guess I'd go back to when I was doing my degree and tell meself what I know now, and to work harder, and that way more rumpy pumpy, and the kind of job I wanted !
failing that, I'd blag my way into NASA in the '60s and go to the moon...
-edit-
oh...I'd definitely go see Pink Floyd and Queen, cos I missed out on those. (narrowly in the case of the 'Floyd)