At the far western end of the island, Madaket is a popular beach, especially for watching incredible sunsets. Sand is soft. The surf can be heavy, so check beach conditions. There are some lifeguards, but not the full length of the beach. No restrooms, and no food service, so bring a picnic . There is some parking.  It's a beautiful area... take the Hyline ferry to Nantucket, grab your beach chair, and enjoy everything the island has to offer.  

Madaket Beach is accessible by bike via a 5.5 mile paved bike path, or take the NRTA shuttle bus (seasonal).