The Provincetown Causeway is at the end of MA-6A.

As you explore downtown Provincetown during your Cape Cod vacation, there’s a good chance you’ll end up at First Landing Park, a site commemorating the arrival of the Pilgrims on the Cape in 1620. The park is full of plaques and markers, making it a great place to check out if you’re interested in learning some of America’s oldest history.

You’ll have outstanding views of Provincetown Harbor from the park, and when you head across the street, you’ll see a rock wall jetting into the water. This wall is the Provincetown Causeway, and it extends across the bay to a section of secluded beach near the Wood End Lighthouse. You can walk the entire causeway, which is a little over a mile long, putting you on one of the Cape’s best-kept secrets.

Cape Cod is a large peninsula extending 60 miles into the Atlantic Ocean from the coast of Massachusetts. Located on the outer portion of the Cape, Cape Cod National Seashore’s 44,600 acres encompass a rich mosaic of marine, estuarine, freshwater, and terrestrial ecosystems. These systems and their associated habitats reflect the Cape’s glacial origin, dynamic natural processes, and at least 9,000 years of human activity. Geomorphic shoreline change, groundwater fluctuations, tidal dynamics including rising sea level, and atmospheric deposition are among the many physical processes that continue to shape the Seashore’s ecosystems. Marine and estuarine systems include beaches, sand spits, tidal flats, salt marshes, and soft-bottom benthos. Freshwater ecosystems include kettle ponds, vernal pools, sphagnum bogs, and swamps. Terrestrial systems include pitch pine and scrub oak forests, heathlands, dunes, and sandplain grasslands. Many of these habitats are globally uncommon and the species that occupy them are correspondingly rare.