What do you know about Markham Nature Park and Arboretum?

 16 acres off northeast side of Cowell Road near Babel Lane and at south end of LaVista Avenue. Galindo Creek meanders through the park. Park amenities include a Nature Study Center used by Mt. Diablo School District and Concord's Backyard Explorers summer day camp, community garden plots and the Garden Center headquarters of the Markham Arboretum Society, whose members are working toward the creation of an international garden to showcase plants from around the world that can thrive in our local micro-climate. Centerpiece of the garden is the Bud Hansen Wisteria Arbor. (http://www.markhamarboretum.org)