The Contra Costa County high point is the scene of several organized hikes Saturday and the seventh annual Mount Diablo Trail Adventure on Sunday.
Included in the Sunday festivities are a marathon, a half-marathon, a 10K run, a 10K speed hike and an educational family hike that begins at Castle Rock Park in Walnut Creek. Participants in the family jaunt will climb fire roads up the slopes of Diablo and finish at Castle Rock.
Besides the spectacle of runners and hikers, organizers are offering live music before and after the competitions at Mount Diablo State Park.
Wouldn’t want to be a tarantula out on those trails on Saturday or Sunday.