Weeki Wachee Springs is a Florida State Park operated by a contracted private company. It is located in the town of Weeki Wachee, FL. The park features a very large spring basin with caverns and caves. Sadly, there is no swimming or diving in the spring. Instead there is a mermaid show viewed through an underwater theatre. The park has a large swimming area with crystal clear water and 4 spring-fed water slides (no chlorine). Since the state bought the park admission is very low and fills up typically before it opens. Arrive 1 hour before opening during the week and 2 hours before on weekends.
The Weeki Wachee River is a hidden gem to kayak or canoe. You can rent a canoe/kayak/paddleboard from the park (arrive early) and paddle downstream to a pick up point for a ride back in a van. You can also rent from a few places at the boat ramp (the kayak shack) downstream and paddle upstream. There are several places to jump off a tree or rope swing along the river. You will likely see manatees, dolphins, deer, turkeys, etc. The water gets clearer as you paddle upstream. A full day can be spent on the river or at the main park.