I think you are going to have to give us more information.  Florida is quite large and more diverse than it sounds.  You can stay the winter in DeFuniak Springs cheaply but will have frost on the ground more often than you expect.  If you want alligators and birds around you need to be where they are.  What kind of activities?  What month do you mean since in January many places are booked solid?  What kind of pricing are you looking for?  How about the kind of shopping and restaurants you would like in a reasonable distance?

We stay at a great RV Resort in central Fl., as we are not water people.  It is north of Sebring on Rt. 27 in Avon Park.  It is an open park in that it is not under any dirty trees or Spanish moss.  All of the trees are palm trees.  I don't know about a 1 month stay as most of the people are there for 6 months.  Their are plenty of activities to keep you busy. There is a lot to see and do in the area as the South Fl. Community College is located there and they have a lot of shows throughout the winter, also the Sebring race track is less than 20 miles away, if you want something closer they have the Lawn Mower races in the area. You can follow the web site that we have listed. 
 
http://www.adelaideshores.com/