Steve, I'm going with a bunch of college buddies and Tony is coming with us. Denny is going as well. My group is seated in Stand H (yay!) and I belive Denny is across from the pits.
There are two go-kart places. You'll want to go to the one up north. There are no reservations, unfortunately, but it's a real nice two level karting track and they crank the cars up on Friday and Saturday. Expect a 2hr wait. The one near the track is usually rented out to BMW or some other F1 team for the weekend.
If you're a BMW or Juan Pablo fan hang out at across from the BMW pits during qualifying. The Columbians will be out in full force and they know how to have an AWESOME time. By the time qualifying was done last year, we were stumbling and merry. :D Also, with the Ferrari pit being nearby, there is usually a little cheering competition between the BMW and Ferrari fans. I'm sure the Honda fans will be out in full force this year, as well, so it should be fun.
Anyway, PM me your cell (I lost it from San Diego) and let's do this. Fun fun. As for nightlife, downtown is usually crackin' on Friday/Saturday.
I'm in on Friday afternoon.