Check out the Cedar Key area.
Yes it's snowbird season and many CG's full up BUT I traveled for several years during snowbird season and never made reservations!!
There are always cancellations and open spots. Either call ahead or what I do is pull in for just one night and then ask if they have any current/upcoming cancellations. Every CG I have been at always has a front row open just for traveling RV'ers. Many times I will ask for just the night and if I like it there I extend my stay in the travelers section and have never been refused.
Sometimes I will get one for 2 or 3 weeks and then maybe have to move over a row or so for the next cancellation. So for you only needing a week or so you should have no problem.