From East Bay Regional Park District:

BLACK DIAMOND MINES REGIONAL PRESERVE - Wow it's hot out here! Where's the water?

While hard to find at Black Diamond in the summertime, water is still important for the animals, plants, and people in the park. Come beat the heat by exploring how water moves all around us and shapes the land with hands-on activities and demonstrations for the whole family. Be ready to get a little wet! Best for ages 5-12 years.

Meet in the upper parking lot, which is a mile past the kiosk.

Black Diamond Mines (Antioch): Upper Parking Lot

http://goo.gl/maps/jPYOx

$5 per vehicle parking fee applies when kiosk is attended.

No-registration required; Drop-in Program only.

For more info, visit: https://anc.apm.activecommunities.com/ebparks/activity/search/detail/56000?onlineSiteId=0&from_original_cui=true