I've been to Derby a few times as a spectator, driving about 3 hrs, staying at the venue. It's a BLAST, even just watching (first time I went got on the elevator up to my room with Reyes and Bustamonte).
Small fridge in the room, no microwave, rooms BIG and pretty nice. Bit of a walk from the rooms to the playing area, no big deal, there's a golf cart shuttle I never used. Been to the casino a few times for yucks, not a gambler, looked pretty typical.
If possible, bring (or stop and get) water/beverages(BEER!)/snacks and something more substantial (subs/bagels/etc.) - food there a bit-to-very pricey and only so-so (never tried the buffet or steak house). Well, everything has it's price...
A great pool experience you'll very much enjoy.