I hate to comment on Pat's comment, I'm a raw rookie by comparison!! I am not suggesting the beach bar is part of the RUI.
Two beachfront hotels at Anse Marcel, the Rui / Radisson / ? to the east and to the west what in 2014 was I think called Le Domaine [de Lonvilliers?].
The beach resto being discussed was in front of Le Domaine and was not completely finished when we visited late Jan? 2014. At that time the beach resto had nothing to do with Le Domaine. I walked around Le Domaine as a french speaking friend had asked me to check it out for a possible vacation - it was tired at the time.
My comment was in reference to the web link which refered to the Anse Marcel Beach Resort and the resto appears part of the resort? so wondering if it is the hotel resto or maybe just an association that works for both of them

J&B