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. Discover a delectable selection of dishes today! Hours: Mon - Wed |. Indulge at The Eatery, a Self-Serve Dining Experience inside Hard Rock Hotel & Casino Tulsa. . River Spirit Casino in Tulsa - one the largest Gaming floors in Oklahoma. Promotions, Player's Club, Dining and Nightlife, live music and performances. is river spirit casino buffet open.