Where can we have a wedding and reception in the Destin or Fort Walton beach area?

We are looking to have a wedding directly on the beach and a reception within walking distance or within beach view. We are looking to spend $7,500 ideally. Our guest list will be 100-150 people. We have a caterer already for $14 a person, but if we can find someone cheaper or they can provide one cheaper, that would be fine. We prefer a DJ for entertainment, and a small group of string instruments (5 people or so) for the actual wedding ceremony. Alcohol will not be on our tab. Any help or experiences that you can share would be great! Also, if a place offers a military discount, that would be a plus as I am military but she is not.