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