Ditto what SGB said!
I have a 13 year old girl at Seaside, and an 8 year old boy at Bay. I had the same conversation that you are having 5 years ago and took a leap of faith to move down here. It has not always been a bed of roses but at the end of the day, I can't think of any other place I would like to be than at the beach and on 30A. I have made more friends here than I had back in Michigan (to be fair, I worked crazy hours back in Michigan and that was a part of the reason to make the move - to spend more time with my family) and I'm trying to not have the same thing happen here.
The biggest adjustment is more driving to get from point A to point B, especially during tourist time, and higher prices at the grocery stores.
There are a lot of great parents here who are committed to making sure their children receive a great education! I think it is something we (the parents who post on here) all agree on!
Best wishes to you!