Don your walking shoes, breathe in the ocean air and set out to discover this picturesque maritime town. You can join one of several organized walking tours or explore on your own. Portsmouth is filled with old homes and museums, and you'll have your pick of fascinating historic sites. Climb aboard the USS Albacore, a retired U.S. Navy submarine offering tours and exhibits. View an 18th-century garden, striking stairway and period furniture at the Moffatt Ladd House, the home of William Whipple, a signer of the Declaration of Independence, or follow a costumed guide through the John Paul Jones House, home of the Revolutionary War naval hero. For a broader look at the city's history, visit Strawbery Banke Museum, where over 40 buildings have been assembled to depict Portsmouth life from 1695 to 1950, complete with costumed actors. If you know architecture, Portsmouth's array of Colonial, Federalist and Neo-classical styles will dazzle you. Weary of walking? Sit down for a meal at one of Portsmouth's fine eateries or relax on a narrated harbor or whale-watching cruise.  Are you a fan of beer?  Portsmouth is steeped in beer history.  Several large breweries including Frank Jones, Eldredge & Portsmouth Brewing Company (where the Seacoast Rep & Ale House Inn are located) once doted the landscape.  Today you can stil tour two active breweries:  Smuttynose & Red Hook.  In addition, the Portsmouth Brewery on Market Street is a large draw.