If your trip to Portsmouth, NH Airport (PSM-Portsmouth Intl.) is all sorted out but your itinerary is looking a little empty, we can give you a few hints and tips.Even if you're only stopping over here, you should still head on out and admire the sights. After all, it won't take you too long to get to Fort Constitution Historical Site.Make your way straight from the tarmac to Water Country. Other attractions you won't want to miss include Portsmouth Brewery and Kittery Outlets.