Florida weather forecasters don't have to change their charts much. Pretty much every day in Spring and Summer gets a thunderstorm icon.
Usually it just means a quick shower sometime in the afternoon. Otherwise, it will be clear and sunny.
The only time we had a total washout was during a trip when Florida got brushed by a hurricane.
Outdoor rides will continue to operate in the rain, but not in lightning.
Find an indoor attraction and wait it out, or join the masses in ponchos and brave the storm.