The Big Break Regional Trail, which runs along the southern edge of Big Break through the Ironhouse Sanitary District, provides access for hikers, bicyclists, and equestrians to the southeastern edge of the estuary. The trail connects to the northern end of the Marsh Creek Regional Trail, providing access to Brentwood and Oakley. The Marsh Creek Regional Trail connects to the Delta de Anza Regional Trail via West Cypress Road, providing access to Oakley, Brentwood, Antioch, Pittsburg, and Bay Point.
From the West (Walnut Creek, Oakland) - From I-680 northbound, transition onto Hwy. 242 towards Concord/Pittsburg, then Hwy. 4 eastbound towards Stockton/Pittsburg. Take right exit 30 toward CA-160/Sacramento//Rio Vista (just past Hillcrest Avenue Exit; do NOT continue straight on Highway 4), Merge onto CA-160; Take exit 1-A East 18th/Main Street (first exit on Highway 160), Turn right (east) at the bottom of the exit onto Main Street; proceed east a little over 1 mile, Turn left onto Big Break Road; Turn right just past the last houses on the right into Big break Regional Shoreline.
http://www.tripleblaze.com/trail.php?c=3&i=7237