Many thanks to Chowhounds far and near for advice. The highlight of our Cape Cod trip was Terra Luna in North Truro recommended by a Truro local on this board. This was a very good restaurant indeed in which quality and taste are presented without pretension. The salads Tuscan bread salad and Caesar (with anchovies) were simple and fresh, highlighting summers bounty. The best item tasted was a grilled duck breast with mashed sweet potato and haricots vert. The duck was tender with a charred crust and smokiness infused the meat. The veggies balanced and complemented this luscious bird with freshness and depth. My dish of penne with wild mushroom ragu with truffle oil was tasty but could have used more porcini (and Italian ones instead of Chilean) and maybe a chanterelle or two, Desserts were good and the pastry chef has a way withfruit mousses. The décor is simple with a lot of local artists well represented. The prices were reasonable and compare favorably to Café Edwige, the previous nights dinner that was fine with larger portions (but not as tasty).
We also tried Clem and Ursies lobster rolls and agree that the hot lazy lobster roll was very fine and avoided the pitfalls of cloying mayo entirely. While many might prefer the smooth melding that a good mayonnaise can provide to the lobster roll, the fresh and simple version here allows the sweet and briny to shine.