Too much of an open-ended question. The first thing you should decide is do you want to wear shorts all winter or a jacket. The next question you should ask yourself is how much do you want to spend per month and how long are you staying.
You can probably find a place "south" for $400 a month. You won't be wearing shorts and they probably won't have a pool.
You could go south of Sarasota Florida and be in nice warm temps all winter long, find a cheaper RV site for between $700 and $800.
You could stay further in SW Florida, keep them shorts on, find an upscale RV resort that has everything including a 50' x 120' site, for between $1500 and $2500 a month.