There are many different water sports these days, and many places on the island to choose from to outfit your specific interests. Below are just some of them. 

Beach Bums AMI
AMI Water Sports
AMI Paddleboard Rentals
Surf's Up Watersports
Salty Buddha Paddle and Yoga Co.
YOLO Parasailing Adventures
Coastal Water Sports
Wavesplash Water Sports
Anna Maria Sailing (Alex and his mom are awesome!)
Spice Sailing Charters
Kathleen D Sailing Catamarans
Catherine's Florida Charters