Contact Old Chatham by phone at 508-385-3616, and we will be able to help you plan your next Cape Cod RV camping trip to South Dennis. The peaceful beach ambience of Dennis is born from the Reverend Josiah Dennis, who remained pastor of Yarmouth's East Parish. The town remains an attraction because it's lack of over development. South Dennis has several top rated beaches along with a conservatory, miles of hiking trails, and views which will take your breath away. At the Old Chatham, we plan on taking your breath away with our friendly carefree attitude and our excellent amenities and activities.