The Big Break Regional Shoreline has a beautiful visitors center that offers exhibits, meeting space and space for an science education program. A short walk from the visitor center is a 1,200 square foot interactive map of the Delta (on the ground) that demonstrates water flow through the region.
It is part of the East Bay Regional Park District (most impressive park system in the state!). The park has the facilities to enjoy a picnic, fish from the pier, launch a kayak or canoe, or birdwatch.
Next to the town of Oakley on the shores of the Sacramento/San Joaquin Delta, on Highway 4 near 160, near Antioch and Rio Vista.