The best crab cakes close to the airport are at The Olive Tree italian restaurant (I believe that is the name, I may be mistaken). Anyway, it's about a two mile drive from Signature. The folks there will know the one I'm talking about. There is another restaurant about the same distance called
G & M (again, I may have this name slightly wrong) which has a great reputation for its crab cakes, but IMO the Olive Tree folks do a better job. Enjoy.