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We're sorry, there are no rooms available on TripAdvisor. About Us Help Center. Rooms Nov 5 Nov 6. It's Tuesday, so the casino should be open, right? The hotel is separate and quite from the casino.HOTEL DEL RIO AND CASINO. THIS HOTEL, THE OLDEST OPERATING IN ISLETON, OPENED IN , DURING CONSTRUCTION IT WAS DISCOVERED. Book Hoteles y Casinos del Rio, General Roca on TripAdvisor: See traveler reviews, 46 candid photos, and great deals for Hoteles y Casinos. And that's about all there is to downtown Isleton: these three blocks. Smack in the center is the large Hotel Del Rio, with a bunch of motorcycles parked out front.