I'm a Michigander like you, and happily spent a month in Florida last winter, an unusually fierce one all over the place!
We weren't towing a camper but put 5,000 miles on the car. From the southwest corner of Michigan to the Florida panhandle was 900 miles. So coming and going accounted for 1,800 miles.
The other 3,200 miles were going back and forth, up and down the state of Florida, visiting family and friends and staying all over the place in motels.
My first piece of advice is to get this book, it's a must have:
Florida Atlas & Gazetteer (Delorme Atlas & Gazetteer): Delorme Publishing: 9780899333991: Amazon.com: Books
Get the current edition. Has lists and contact info for campgrounds, golf courses, tourist spots, etc.
Here's some opinions formed from all the travel.....
The panhandle was nice but it was not warm. We have friends there wintering in Navarre Beach, between Pensacola and Panama City. In February some of the high temps were only in the 50's. They are spending in the neighborhood of $1,800 a month in the winter for a beautiful beachfront condo but it's hard to enjoy the beach in those temps. No doubt the temps were caused by the unusually frigid winter all over the eastern US.
We went up and down both coasts (twice on the Atlantic coast) and also spent a week in the keys, specifically Key Largo.
The keys are beautiful but we were staying in a nice hotel. The campgrounds we passed driving through the keys looked like parking lots, rv's very close together with little or no shade.
I tried to stay off the interstates and really enjoyed the scenery and driving through so many towns that weren't so touristy.
While I wasn't shopping for a seasonal campsite I got the impression that $900 a month was not uncommon for the rv resorts.
My wife and I are going back for ten weeks next winter. We'll spend a week in the keys, a week with family on the gulf coast near Venice, and 8 weeks in what I'd call a "park" model home in a resort by Sebring. We really liked Sebring. Not too big and nicely located.
Both Florida coasts are just 90- minutes or a couple hours away. Going the same distance north and south will take you to the Orlando theme parks or the Everglades and Lake Okeechobee.
Prices seem lower away from the coasts. The resort we are going to is one-third double wides, one-third single wides, and one-third rv's and is located on a chain of three small lakes.
I'm not wishing away the rest of this summer or fall
but the upcoming trip to Florida will be a welcome respite from winter!
And I'm looking forward to visiting the Scamp rally
in Sebring this coming February.