If your trip to Walnut is all booked but your travel itinerary is looking a little empty, let us give you a few hints and tips.A scan of a postcard stand will tell you that a trip to Walnut is not complete without visiting California State Polytechnic University Pomona. As the most iconic attraction in the area, you might want to spend more time here than a quick stop.Keep yourself on the go by checking out Raging Waters and Puente Hills Mall. If you still have plenty of stamina and space on that itinerary, La Puente City Park is also whispering your name.