John D. MacArthur Beach State Park, named for John D. MacArthur whose Foundation donated a portion of the land for its construction in the 1970s, is located on and just north of Singer Island, Florida in North Palm Beach, Florida.

It covers 438 acres (1.8 km2) on land and underwater, including an estuary crossed by a 1,600-foot (490 m) boardwalk, and Munyon Island (named after James Munyon), a wilderness isle in the Intracoastal Waterway that was home to the lavish Hygeia Hotel at the turn of the twentieth century.

Hiking trails and pavilions are open for public use on Munyon Island, which is accessible only by kayak or boat.

Many species of birds also visit the park, including peregrine falcons, wood storks, and least terns.

Beach Outfitters Gift Shop and Kayak Rentals, operated by Friends of MacArthur Beach State Park, offers a variety of gifts and provides rentals of kayaks, dive flags, lockers and binoculars.