Another Italian restaurant has opened on MDI. Bella Mare is located in Manset. For long-time visitors to the area, it is in the building on the Manset waterfront, very near Hinckley boat yard, that once housed XYZ.
Their menu is more limited in scope than is Guinness & Porcelli's. The sauces are excellent---I had the marinara sauce with the grilled calamari and the bella mare sauce (think of the classic white [not Alfredo] sauce, with more herbs and lemon) on the Frutti de Mare.
Appetizers run from $5 to $10; most entrees are $13-20, with a couple of high-end entrees (stuffed filet mignon, frutti de mare) in the 428-33 range. Nice wines by the glass, full bar, and the view of Southest Harbor and Greening Island is very nice.