Looking for a Florida vacation spot in December. Suggestions?

Last year our family—wife and I and two kids (6yrs and 3yrs) went to Sanibel Island for a week and loved it. We’re planning another week long trip to get out of the winter weather in Cleveland and I’m wondering if anyone has other suggestions for places we ought to check out. What we liked about Sanibel was that it wasn’t super overdeveloped; lots of little hotels and homes; small town feel; beautiful beaches; several restaurants to choose from (few chains); pool for the kids; local bookstore; easy to bicycle around the island; close to Fort Myers airport.

I’m sure there are many, but can anyone recommend similar spots in Florida? Islands or just beach towns that aren’t super overdeveloped, have a small town feel, and some things to do locally—even if it’s just restaurants and bookstores?

Thank you!