If you like both lobster and macaroni and cheese then you must get the lobster mac n cheese, it's well worth the money.
Oysters and a Warm Shrimp Salad are a great lunch combo. If you're in a big group, go for the Grand Plateau.
Sadly heard rumors that this particular item was taken off the menu, but the "Angry Lobster" (huge lobster chunks, in mashed potatos & mixed vegetables) was the most satisfyingly delicious meal EVER.