Do you have to pay to go to Cumberland Island?

Excuse me, I'm a bit confused about the access to Cumberland Island. Could you please clarify if there's a fee required to visit the island? I'm interested in exploring its natural beauty and historical sites, but I want to make sure I'm prepared financially. Is there a specific amount I need to pay, or is there a range of prices depending on the activities I plan to engage in? Your guidance would be greatly appreciated.