If you sit by the bar you get to hear some pretty interesting conversations between the charming, well informed staff and shy, "I'm not sure I actually like oysters" friend of someone that LOVES oysters and dragged shellfish newbie out to this charming restaurant. If you arrive early (before 7) it is easy to get a seat. After that reservations recommended. You can even walk in off the street and order a platter for take-away. But I'd call ahead during peak hours.
Oysters. Lots of them. They have three house made sauces. But these oysters are so fresh they barely need a dash of lemon.
I had 6 Black Point large and and 6 St. Simon choice. Just amazing. And if they have them available, get some Barnstable. You won't be disappointed.
Also good chowder.