Assateague Island in Maryland is a beautiful getaway.

https://wiki-triod.win/index.php?title=Pets_and_Family_Vacations_-_Best_Beaches_for_Your_Pets

Assateague Island in Maryland is a great place to enjoy a scenic getaway. Known for its wild ponies and beautiful landscapes, this national seashore welcomes leashed pets on certain beaches for unforgettable adventures