By Car:

From I-93 North: Take exit 20 in Tilton, NH. Turn left on Rte. 3N. Travel along Rte. 3N for about 10 minutes. Bear right onto the Laconia By-Pass 3/11 (just past the Belknap Mall). Take the second exit,  Rte.11A in Gilford.  Turn right at end of exit ramp.  Follow 11A east approximately 5 miles to Gunstock Mountain Resort.  Entrance is on the right.  

From I-95 North: Just south of Portsmouth take split to Routes 4 & 16 (Newington).  This will put you on the Spaulding Turnpike.  Take Spaulding Turnpike to exit 15W for Rte. 11W to Alton.  Stay on Rte. 11 around Alton traffic circle and around Alton Bay.  Take a left onto Rte. 11A.  Take Rte. 11A approximately 5 miles to Gunstock entrance on left. 

From South or West of Boston: It may be best to travel north on I-95 or I-495 and then exit off onto I-93 north. This route is probably quicker than following I-95 to Portsmouth NH, although traffic conditions can vary.