Lots of nice warm spots down here at this time of the year, although it is going to get cold down here this weekend. Actually the weather forecasters in Ft. Myers are saying there could be a freeze this weekend inland.
That said, you will need to start looking as soon as possible. Places down here in January and February are at a premium.
The Naples area has quite a few parks, although there are a couple that are 55 + with age and size limits of the unit. There is also a park down here that unless your rig cost over 500K you can't get in the gate.
Probably the best thing would be to grab a Woodall's and start calling.