If your trip to Diamond Bar is all locked in but your itinerary is a little on the empty side, let us give you a helping hand.If there's one thing that encapsulates Diamond Bar, it's California State Polytechnic University Pomona. Be sure to take some fabulous pictures in front of this iconic attraction to show off to your friends when you get home.Keep yourself occupied by exploring Brea Sports Park and Black Gold Golf Club. If you still have plenty of energy and space on that itinerary, SpeedZone Los Angeles is also whispering your name.