Eastham is bounded by the Atlantic Ocean to the east and Cape Cod Bay to the west, with nearly a third of the town preserved within the boundaries of the Cape Cod National Seashore Park. Make sure to stop by the Cape Cod National Seashore visitors' center, which is a popular stop for visitors interested in learning about this vast natural history. Bring your walking shoes, as many of Eastham walking trails overlook Cape Cod bay and ocean beaches.