There are beaches everywhere! The bayside has calmer and warmer waters whereas the Atlantic side has bigger waves and slightly cooler water.
Chatham is known for being one of the most picturesque and charming towns on Cape Cod, and since it’s only about 15-minutes from Harwich, this is a place you’ll definitely want to visit.
Chatham is an awesome shopping destination with a long Main Street filled with shops and restaurants.
The ferry is close-by in Hyannis. You can spend the day or a couple of hours exploring Nantucket or Martha's Vineyard.