Attaquin Park Beach is the place to go for freshwater swimming and boating. It is located on Mashpee-Wakeby Pond the largest freshwater body on Cape Cod. Attaquin Park Beach is located at 40 Lake Ave, Mashpee, MA 02649. It is open daily from 7:00 AM to 8:00 PM and has a rating of 4.5 stars. You can also reach them at +1 508-539-1416. Directions: Located on the side of the pond off Route 130.