Rock Crusher Canyon RV park in Crystal River is a great place to see some of old Florida. Manatee's will still be in abundance during that time. They have many tours that will take you out to see them and snorkel also If you want. Old Homosassa is a great area to see some of original Florida as well as Cedar Key, a bit North of there.
Also a small campground is in Chassahowitska, Fl has some nice sites. We live about a 10 minute drive from there. They have canoes and small jon boats for rent, and a spring you can go to by water.
Nature's Resort in Homosassa is also a good spot....pontoon boats, pool, marina, and lots of scenery to see.