I know heat the same day is bad...but it feels so good!
We stay at Coronado Springs. I like the Pepper Market and it's got one of those big, bad hot tubs! If I could afford (and liked it better) we'd stay at the Poynesian, since you can pretty much walk from the finish (at least of the half). The earlier you finish, the easier it is to get back. If you finish the half in less than two hours, I've found, the bus transport doesn't take very long...incentive for me to get faster!
Of course, next year will all be different since they've split the races!