Link to searchable U.S. map resources with parks, trails, campgrounds, historical sites, marinas, etc.
The best source for local maps is Sarasota County Parks/Recreation and Natural Resources where you'll find a full list of natural areas, each with its own page on which there's a map link which can be viewed on line or downloaded as a PDF.
Deer Prairie Creek Preserve Brochure and map
(link to Sarasota County Parks site):
Link to BikeVeniceFlorida maps: SCORR maintained trails in the "Carlton Complex"--Boldly Go, POLR, SOTR, Live Long and Prosper