Portsmouth Harbor Trail: a must do while in Portsmouth. The trail goes by over 70 points of scenic and historic significance throughout the town. Maps are available at the Greater Portsmouth Chamber of Commerce, 500 Market St, or right at the Market Square info kiosk where the tours start. 

Make sure to tour the Market Square, the heart of downtown, where several walking tours begin. It is the heat of town, with many original 17th-century buildings, excellent restaurants, interesting galleries, bookstores and antique shops.