South Jamesport Beach is a well-maintained beach area located off of Peconic Bay Blvd. in Riverhead. In addtion to 3,000 sqaure feet of waterfront, it has a snack bar, restrooms, playground, picnic tables, grills, tennis courts, basketball court, volleyball nets, and a marina on-site. This beach features special wheelchairs that allow visitors that need them to use the beach. Parking is by permit only.
For private events, a facility use permit application must be filed with the Riverhead Town Clerk's office. This beach also has a Piping Plover Nesting area, which is off limits to the public, through June.