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Photo: Mx. Granger, CC0 via Wikimedia Commons
A man made lagoon where swimming and fishing is allowed, a lot of great trails and scenery to see as well. Park at the intersection of Frederickson and Contra Loma, or turn N on Contra Loma and drive N to the parking near the lagoon.
Contra Loma Regional Park is a 780-acre (320 ha) regional park in Contra Costa County, California. It is part of the East Bay Regional Parks system. It is located in the city of Antioch and includes an 80-acre (32 ha) reservoir.
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This walkable 6,481-yard, par 72 golf course is located along the rolling hills of Antioch, featuring plenty of trees and scenic vistas, complete with its own restaurant and private events space.
A great place for the family to go bowling.
The Black Diamond Mines Regional Preserve includes the remains of several coal and sand mines and the sites of five long gone coal mining towns (Nortonville, Somersville, Stewartville, West Hartley and Judsonville). Safe sections of the mines can be toured on a guided tour. Importantly, do not attempt to enter any of the mines without a guide. (Though, this would be difficult as gates have been installed on all entrances.) Some of the coal seams are still offgassing, and deaths from hypoxia have occurred in the recent past when the abandoned mines were a party spot for local kids. Also within the park is Rose Hill cemetery.
An indoor skating rink to go skating around or for roller hockey. Only open to the public from Friday-Sunday. Private events M-Th.
A waterpark that is fun for people of all ages, has a variety of slides and pools.
A concrete, city-built skatepark for skateboards and rollerblades, free to all bikes are not allowed inside, bring water as there is little shade and it gets hot in the summer.