My husband and I go to Crystal River at least once a month in season and love to kayak rather than than take a charter. There are plenty of places you can rent kayaks (we like Aardvarks) for about the same price as a charter, and you can go at your own pace and spend as much time in the springs and with the manatees as you want. There are plenty of places that are easy to get in and out of the kayak in the three sisters. It's nothing for us to spend 3-4 hours in the Three Sisters area, with a charter you get about 45 minutes or so and there are 20-30 other people in ther water with you. Kayaking gives you that wonderful time between the charters to enjoy the manatees without the crowds.