River Mouth Beach Address River Mouth Beach PR-413 Bo. Puntas Rincón, PR, 00603 Contact View on a Map Get Directions About Located in Barrio Puntas in Rincón this beach east of Antonio's Beach. Videos & 360° Tours Amenities Payment Methods Accepted Meetings Facilities Meeting Rooms sq. ft.Largest Room Sleeping Rooms sq. ft.Meeting Space Download Floorplan Event Spaces / Meeting Rooms Room Sq. Ft. Theater Classroom Banquet Reception Deals