Estero Bay is a large, open coastal bay in Southwest Florida, part of the Great Calusa Blueway paddling trail system. The bay is characterized by extensive mangrove shorelines, backwaters, and several islands, creating a mix of open water and sheltered passages. Paddlers can access the bay via several key launch points. The Estero River, a spring-fed tidal river, provides a popular inland route, with launches available at Estero River Outfitters on Tamiami Trail and at Koreshan State Historic Site, which has a boat ramp. From the outfitters, it is 4.5 miles downstream to the bay. Other access points include Lovers Key State Park and launches in Bonita Springs for the Imperial River, another tributary. The entire nine-mile designated paddling trail on Estero Bay is considered suitable for intermediate paddlers who must be comfortable with open water conditions, including wind and potential boat traffic. A notable hazard is powerboat activity, particularly in the lower Estero River and open bay areas, requiring vigilance. The bay's maze-like mangrove tunnels and backwaters, such as in Hell Peckney Bay, offer protection from boat traffic and wind. A primary destination is Mound Key Archaeological State Park, an island consisting of large shell middens located approximately 4.5 miles west from Koreshan State Park. Paddling to Mound Key involves crossing open bay. Tidal currents significantly influence paddling, especially on the tributary rivers; trips should be planned with tidal stages in mind, and guided tours often schedule departures around tidal conditions. The area is rich in wildlife, with frequent sightings of dolphins, manatees, and a variety of coastal birds. The water is generally clear and shallow in the backcountry areas, allowing visibility of marine life like starfish and sand dollars. Facilities are limited to the launch sites; Koreshan State Park charges a vehicle entry fee. The bay offers a range of experiences from historical exploration to remote, natural paddling through mangrove ecosystems.