Perhaps a good place to start, as far as field trips are concerned, is to spread the word about trips already coordinated by various organizations.
Check out Tampa Audubon's field trip webpage which offers a wide variety of options, open to the public, throughout the year: http://www.tampaaudubon.org/fieldtrips.htm
Tampa Bay Sierra Club: http://florida.sierraclub.org/tampabay/
Suncoast Native Plant Society: http://suncoast.fnpschapters.org/events.html
American Littoral Society- Southeast Chapter: http://www.sealitsoc.org/events.htm
Plus others, like the Eagle Audubon Society of Sun City Center, that don't have a webpage- contact info to follow...
If you know of other groups that organize trips, please add a comment.