[Reed B.]

My useless 2 cents:

Houston, TX: disputably the most "central" location you could get. Personally I'd like to know how the teams spread out over the continent before committing to the site, though.
Orlando, FL: Ah, the old standy. All of you know more or less about this by now. It sucks to fly there from the west coast, though.
Washington DC: Eh, a so-so location. There's a lot of historic stuff, to be sure, and while it would historically insightful and all, you're not here to read about Lincoln, you're here primarily to commandeer your rickety robot death traps to pick up balls.
Las Vegas, NV: Yes, it is the city of sin. Yes, it has almost no redeeming qualities to anyone below legal age. But if your idea of heaven is streets covered with free porn mags (no, I'm not making this up), then Las Vegas has your number.

As far as locations without entertainment: folks, we're building robots here. I'm sure you could figure out something to bring to occupy your spare time whenever you have it. Some of my teammates (myself included) brought along our gaming systems: if you can keep track of the things, put them away when you're done, and crack through whatever "security" mechanism the hotel's installed on the hotel TV (which can be easily overcome in many instances by a $10 adapter for your gaming system), you're in business. If you can't manage that, bring some cards (or CCGs, or RPGs, whatever).