Hello Mark,
Any month is a great month to fish in Florida. Depending on the variety or specie there are better times than others. March is a great month for Bass because they are still bedding in march. That usually is in shallow water and accessible without a boat. Many lakes and the St. Johns river are accessible without a boat. Typically the first few hours at sunrise and before sunset are the best fishing times. The Florida Fish and Wildlife website will give locations of public ramps and fishing areas from the shoreline. Or locate a bait shop online near where you will be staying. They can tell you where to go to fish via from land or with boat rentals. And if you want to land a trophy bass there are dozens of excellent guide services that can do just that. It is a great way to insure the best fishing experience with vacation time restraints. And if you want to fish the surf or from a pier along the coast there are many locations, east or west coast. Many piers will have bait shops and will gladly help make your day productive.
It all depends on the amount of time you are vacationing and the hours you are willing to spend fishing. I would be happy to help in many of these alternatives when you can tell me the location of your stay. Feel free to contact me again if I can assist.
Regards and tight lines,,,, Stu