If your trip to Flagstaff is all organized but your travel itinerary is looking a bit empty, let us give you a helping hand.Whatever you do, don't forget to bring your camera when you visit Lowell Observatory. This terrific attraction is sure to provide some unmissable photo ops.Stop by Flagstaff Extreme. It's one sight you'll usually find on travelers' must-do lists. If you still have some room on your schedule, Museum of Northern Arizona and Thorpe Park will keep you busy as well.