If your trip to Columbus is all locked in but your itinerary is a bit on the empty side, let us give you a helping hand.Experience the best that this city has to offer by adding COSI and Columbus Museum of Art to your itinerary. If you've got an extra day or two to spare, have a look at Ohio Stadium and Historic Crew Stadium too.Plan a stop at Nationwide Arena. It's one sight you'll usually find on many travelers' must-do lists. Ohio Theatre and Palace Theatre are also close by and worth a pit stop.