It's a little late in the year to see the eponymous critters at Manatee Springs State Park--they head out to the gulf as soon as the water warms up.
But their absence didn't bother us as there are a boatload (so to speak) of healthy cypress trees and their attendant knees on hand to appreciate. The setting is quite reminiscent of the defunct "classic" Florida attraction, The Tom Gaskins Cypress Knee Museum.
PS: park management has thoughtfully provided a manatee mock-up of sorts to keep visitors from going home empty-handed in the (frankly pretty darn boring) aquatic mammal sighting department.