In your opinon..best family vacation spots.

What are some of the prettiest and coolest little vacation spots (family friendly) on the coast?

I am looking to the get the most bang for my buck and entertain family of all ages.

Having been to some very exotic beaches around the world, I know I won't be too impressed by the beaches on the gulf (been there, done that long ago), but I still would like to take my family somewhere they will enjoy.