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