If your trip to Ontario is all sorted out but your itinerary is a bit on the empty side, let us give you a few hints and tips.Ontario Mills Shopping Mall is a must-see attraction in this impressive city. Pop in and find out what makes it so alluring.Stop by Ontario Convention Center. It's one attraction you'll usually find on most travelers' must-do lists. If you still have some space on your schedule, Boomers Upland and Museum of History and Art will keep you amused as well.