$5, up to 8 people in a car.
Family annual pass for FL parks is $120, or $90 for veterans (+ tax). The pass is free for veterans with service related disabilities. At all the parks we have visited that you enter by vehicle, the family pass allows both of us to enter on our motorcycles. The only parks that restrict entrance to two people only with the pass are Homosassa Wildlife Park and Weeki Wachee Sorings.
I think 5 a car load
If you use the state parks frequently, consider an annual pass. Discounts for military, vets, ex military, etc
$5/Adult $2/youth as of December, 2018
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