You can find a detailed and updated Florida map on official sources like the Florida Department of Transportation website, Google Maps, or MapQuest. Printed maps are also available at bookstores, travel centers, and online retailers like Amazon.
Just follow the smell of orange blossoms and the sound of retirees honking at iguanas. But seriously, buy a laminated one. Florida humidity will turn a standard paper map into a soggy napkin by the time you hit Tampa.