What a wonderful arboretum! Free admission and free parking, but they appreciate donations. The arboretum has numerous small trails (40+), ponds, bird life, the 1894 Clark home (Fullerton’s pioneering physician) and of course numerous gardens: children’s garden, rare fruits, herb, conifers, palms, deciduous forest, chaparral, Channel Islands, opunta, agave and the “living fossils.”. The arboretum has a small nature center for the children to touch and explore. Also, a museum (closed when we were there) and a potting shed where plants are sold from their cuttings. There are many small trails that almost always loop to the main trail. My children 6 and 2 had a great time exploring and walking. I think most people can cover the whole arboretum in 2-3 hrs. We will certainly return!