My cousins and their bfs are visiting Boston from New Jersey easter weekend and I want to take them out for dinner on saturday night. Before I became chowhound-obseseed and really into food/restaurants, I took them to Barking Crab, which I thought was a fun experience. They want to go there agin, but I said I can prob find a place that has better seafood (they like lobster, crab, mussels, etc). I know Neptune/B&G has great oysters and Atlantic Fish co has great seafood...but I'm thinking of somewhere that is more casual. Any suggestions?