When guests arrived, they decorated some cardstock sea creatures and taped them to a posterboard "ocean." I also had a fishing puzzle out, and some ocean books. Intended to have the fishing game as well, but realized it was at the cabin. Oh well - that one always ends badly at our house anyway.
The kids "fished" for the prizes in their goodie bags.
Snacks were Goldfish crackers and Swedish fish.
I also made little fish sugar cookies for the gift bags - I thought the little "3s" on the side looked kind of like fins!