River Spirit Casino in Tulsa - one the largest Gaming floors in Oklahoma. Or a sports bar for catching the game on one of the biggest TVs in town? We've got the best restaurants in Tulsa! River Spirit Casino Resort: Lunch buffet - See traveler reviews, candid photos, and great deals for Tulsa, OK, at Tripadvisor. Indulge at The Eatery, a Self-Serve Dining Experience inside Hard Rock Hotel & Casino Tulsa. Discover a delectable selection of dishes today! Hours: Mon - Wed |. . is river spirit casino buffet open. Promotions, Player's Club, Dining and Nightlife, live music and performances.