Like Seane, I'd love to travel to a lot more often. 'Off the grid' locales tend to be my favorite.
I also wouldn't mind attaining my pilots license. To be fair though, I have no real interest in flying the slow and highly unreliable prop-aircraft that you see scattered across the sky (or ground). No, I'm still clinging onto my childhood fantasy of piloting either retired or current-production fighter aircraft. I guess my diecast replica's is about as close as I'm going to get to that experience. :D
On a more realistic note, I wouldn't mind getting into things like: Lego collecting, painting, music composition, fitness, salsa dancing, electronics engineering, or even creating a little youtube channel that would cater towards my existing hobby, Hi-Fi stereo.
Hmm. Looks like I have a lot of work ta-do!