Full disclosure: I live about 2 miles from the borders of the Arboretum. During most years, I probably visit 25 times. Sometimes I'm there on foot, more often on my bicycle, and less often bringing visitors to see this wonderful place.
This huge place (it has two parts separated by a street) gives visitors the opportunity to walk, run or ride (by bicycle) through a landscape filled with shrubs and trees from all over the world. A series of paved walkways (and some dirt pathways) lead through the grounds, mount the two hills in the two parts of the Arboretum, and lead the visitor to some dramatic vistas.
Tips: Come in the late Spring to see the lilacs blooming; bring your dog (on a leash in the main part of the place); get a handicapped permit (during weekdays) to take a non-ambulatory visitor in your vehicle to see the sights from the road; take a look at the descriptive plates hanging on the trees; DO NOT MISS the remarkable Bonsai exhibit!
This review is the subjective opinion of a TripAdvisor member and not of TripAdvisor LLC.