Fort De Soto Park
Fort De Soto regularly turns up on best-beach-in-America lists, but the reason it belongs on a family list is North Beach’s lagoon - a shallow protected pool separated from the Gulf by a sandbar, where the water is warm, still and waist-deep a long way out. There is a genuine fort to climb over with its original mortars, seven miles of paved trail, a two-mile canoe trail through mangroves, and a large dog park with its own dog beach. The campground sits on the water. It is a county park, so entry is cheap.