Must you wear a wet suit or is just a bathi g suit permitted? Thanks

I don't know if the wet suit is a 'must', but I highly recommend it. The spring is only 70°-72°. My group was in the water floating around to veiw the manatees for an hour. By the time I got out my hands and feet were numb, but the wet suit kept me from getting hypothermia. I didn't realize how cold I was till I got back on the boat. Overall, the experience is amazing and well worth the effort.

I think it is on your decision. We were there in winter and it was too cold for only swimming wear.