Riverside RV Resort in warm southern Florida near I-75 exit 170. It has an Arcadia address but is actually much closer to Port Charlotte. They have a boat ramp/dock on the Peace River which many kayakers use. 500 sites and the park is full during the winter. I like it because they have larger lots for many sites.
If interested you may want to call now for next year - will probably get put on 'the list'.
The park was sold in late 2016 and is now an Encore owned park. Hope that will not be a bad thing.
You can read reviews on rvparkreviews.