The Rio Mar gaming house is committed to providing our guests with a positive gaming experience. Our guests praise the pool. But. 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. This casino is strictly a casino. There are wonderful. Play the slots or video poker games with a complimentary icy cool house. Try your luck at our 7,square-foot Rio Mar Casino. Most. The grounds are beautiful with nice landscaping, walking trails, great pools/beach and of course the Five O'Clock Somewhere bar. . Book today. The location is great with access to the beach, there are multiple pools, and the rooms are quite comfortable. There is no theme and nothing unusual. The blackjack was very pleasant and knew the job well. 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. Enjoy free WiFi, 3 outdoor pools, and 2 restaurants. 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.