I have taken all the tours offered by the Arizona University Arboretum. Tours are offered about twice a semester. They start at 8am in Sep-Oct, and at 9:30am in Nov-Dec. If you want to find free parking, you must go off campus. You need to register but it is free and your confirmation will show you a map of the campus with parking information. These tours are led by Pima County Master Gardeners, and they are full of pertinent information and great at answering your plant-related questions. There is even a History Tour of the campus.Wear comfortable shoes and prepare for sunny weather. The tours offered are Desert Landscaping, Trees Around the World, Sonoran Native Plants, Edible Landscapes, Medicinal Plants, and Environment and Natural Resources.The tours last between 60 and 90 minutes – contingent on how many questions are asked of the tour leader(s). It is low key and very informative. It’s also a great way to just be outdoors among nature while seeing a side of the university that can easily be overlooked.You can also do this by yourself, using one of their interactive maps – I prefer taking advantage of the knowledge of these Master Gardeners. Enjoy