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