NH has a magnificent network of trails, great for hiking, dirt bikes, 4-wheelers, 4WD, snowmobiles, skiers, and dog sleds. Pretty much covers anybody who owns a scuffed-up set of outdoor boots.
I live in vermont but work in NH. Are you looking for kid type stuff to do.. adult stuff... I can give you alot of info on things to do after I know what exactly your looking for
Portsmouth is a fun town. The best place for just relaxation is the Christmas Farm Inn in Jackson. All inclusive and just North of N. Conway. Ski, shop, fish, party. It is all there.