In fact, it is definitely possible to go shrimping without a boat in Florida. You can catch a bunch!
Check out our website devoted to doing it!
http://www.ozelloshrimper.com/
We provide all the information you need to learn how to catch shrimp on the grass flats on low tide, have maps of where to go, teach you how to clean and prepare them (with recipes) and sell specialized equipment to catch them quicker and more efficiently.