If you are going in the summer you might want to consider somewhere like Captiva which has the South Seas Plantation complex. It's not cheap, and you can rent through individual home owners, but they offer lots of sports activities. They have a little bus that takes everyone round to the beach for wind-surfing, or boating, or golfing at one of the courses, tennis courts etc. Full of families with children and loads of teenagers.
The Sundial complex at Sanibel offers a cheaper alternative but not as many things to do.
Nothing worst than travelling with bored teenagers (and I've got 2 so I should know!).
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