Our guests praise the pool. Most. Book today. Try your luck at our 7,square-foot Rio Mar Casino. There is no theme and nothing unusual. Enjoy free WiFi, 3 outdoor pools, and 2 restaurants. The location is great with access to the beach, there are multiple pools, and the rooms are quite comfortable. The grounds are beautiful with nice landscaping, walking trails, great pools/beach and of course the Five O'Clock Somewhere bar. . The Wyndham Rio Mar Casino is in Río Grande, Puerto Rico and is open daily 10am-2am (slots); table games noon-2am. The Gaming Division of the Puerto. The blackjack was very pleasant and knew the job well. Stay at this 5-star luxury resort in Río Grande. Try your luck in the fun and relaxed atmosphere at Wyndham Grand Rio Mar's on-property casino! A variety of slots & table games are. But. There are wonderful. This casino is strictly a casino. Play the slots or video poker games with a complimentary icy cool house. The Rio Mar gaming house is committed to providing our guests with a positive gaming experience. Wyndham Grand Rio Mar Puerto Rico Golf Resort has an unmatched beach location, nine restaurants, and three pools.