Anna Maria Island has a free Trolley Service that travels daily up and down the island between Anna Maria Island and Coquina Beach, from 6AM- 10:30PM, about every 20 minutes. It is a cool ride on a hot day. About every 2-4 blocks there is a Trolley Stop, most have covered seating while you wait.
Check the Trolley Schedule for Anna Maria Island and neighboring beaches. You can get on the Long Boat Key Trolley and for .75 cents, ride it all the way to Sarasota and back.