Maggie's Farm

The Monomoy Islands are where the the ocean longshore currents are taking the land of "lower" Cape Cod (ie, the upper part), at an average of 3' of shoreline per year. This is post-glacial shaping. Cape Cod, like Long Island, is a glacial construction - a moraine. Like all land, a permanent work in progress.

Just south of Chatham on the elbow of the Cape, reaching south towards Nantucket, the Monomoy islands are a National Wildlife Refuge. They are full of seals, nesting shorebirds, and are a busy migration resting place. Also, the fishing there is wonderful. You can even do flats-style fishing for Stripers.

You can visit these (relatively) new islands by boat from Chatham. Nice little trip. You can stay at the Chatham Bars Inn which, I admit, has gotten fancier over the years. There are plenty of B&Bs.  Chatham is pleasant.