Funny, I'm just wrapping up a fathers/sons fishing trip in Port A.
If you plan to go to the beach and want to drive/park on it, you'll need a beach permit (available at just about anywhere including the conceive store- Stripes- at the main beach access road). The water was great today.
Eating in Port A:
Trout Street (eat outside and enjoy looking at the boats); chorizo crab cakes are awesome
Shells (this is the favorite place of my buddy who is a bit of a foodie; closed on Tuesdays)