Three Sisters is part of the Crystal River National Wildlife Refuge System and is managed by the US Fish and Wildlife Service in conjunction with the city. By land, entry cost $20 per person, no matter if you walk, ride, or drive in. Also, water access is prohibited from the land, so while you can enjoy the scenic hikes, the boardwalk, and catch glimpses of manatees, you will not be able to swim in the springs. In order to enjoy swimming or paddling in the springs you need to enter from the water via Kings Bay. Certain areas (sanctuary zones for manatees) will be restricted from swimming or paddling during manatee season (November 15th-March31st). However, you can still swim into the main spring area during manatee season and it is also the best time to see manatees obviously. If you pay to visit the boardwalk/land surrounding the spring, they do have nice public restrooms and a public water fountain. There are also FWS volunteers year round at the springs ready to answer any and all questions you may have regarding springs, manatees, or local wildlife.