[cornishfrogboy]

Anywhere pretty much between Pensacola, Destin and onwards to Panama on the Panhandle.
Anywhere pretty much between Clearwater and Naples on the better known part of the Gulf Coast.
You have quite literally hundreds of miles to choose from.
I would be delighted with any of the below and have sampled them all..
Pensacola Beach
Destin in front of Henderson State Park
Clearwater
Anna Maria
Holmes
Bradenton
Fort De Soto
Venice
Casperson
Naples
Delnor Wiggins State Park.

Others like Siesta Key, Treasure Island and Sanibel, but I cannot comment as I have not been.

It is really down to research and knowing what you want. For me, it would be Pensacola or Henderson State Park, but they are all stunning.