I and my family vacation every summer on the Cape, and one of our highlights is visiting the Yarmouth House for dinner. This place is consistently excellent, both the service and the quality of the food. This year, my daughter and I both got the Chicken Parmesan, which is a huge, thick chicken breast coated with panko bread crumbs (which makes a difference as opposed to regular bread crumbs) served with perfectly cooked al dente pasta. My only issue was that there wasn't enough red sauce for my or my daughter's taste, but that was quickly rectified by our excellent waiter George, who promptly brought us extra sauce.
My wife got the Chicken Risotto, which was fantastic (I kept picking at it), while my son got the 10-ounce Prime Rib, which was cooked perfectly, with very little fat. We wanted to get dessert because the menu looked fantastic, but the huge entree portions left us too full. One of the many things we like is the fresh bread served with a garlic & herb-infused oil, and I'm not even a bread person.
The Yarmouth House is a bit pricey (but well worth it), the wait can be long on weekend nights, and the large menu selection can be a bit overwhelming for newbies, but you won't find a better restaurant in the Yarmouth area.