Have a close family friend with Celiac's. Pizzeria Uno has GF items and vegetarian menu too.
http://www.unos.com/nutrition.php
I'm pretty sure Guisseppe's in Meredith offers a gluten free pizza.
Also, If you are inspired to cook or grill at home , then consider Wining Butcher in Gilford and Meredith. some of their marinated beef and chicken are gluten free, just ask them which.
We've also dined with our GF friend at 99, Fratellos and Patrick's Pub and give them all a thumbs up!