Location: East Bay
Info Links: http://www.ebparks.org/parks/hayward
http://baytrail.abag.ca.gov/
Summary: Starting at the Hayward Regional Shoreline Interpretive Center near the east end of the San Mateo Bridge, run north along the dirt path all the way up to Marina Park in San Leandro. The trail is easy to follow for the most part. When in doubt, stay toward the bay. The trail follows the bay shoreline, sometimes on levees and crossing a few little bridges. Some small trails head inland to other trailheads but you'll realize that pretty quickly. A couple head toward the bay out to dead-ends too. Check the gmap to get an idea of where that happens. There's not many water stops so carry plenty! There is no shade whatsoever so avoid running it late in the day or on really hot days. You can check out the Bay Trail website for options for extending the run. You can keep going north to Oyster Point but I haven't done that.
Gmap: Hayward Regional Shoreline
Related Blog Post: http://runningstories.blogspot.com/2008/03/long-run-at-hayward-shoreline.html
Distance: 15.0 miles
Conditions: In Hayward, dirt path. Toward San Leandro, Paved
Profile: Flat
Start: Hayward Shoreline Interpretive Center http://www.haywardrec.org/hayshore.html
Park: On street in front of Interpretive Center (no fee)
Water: The ONLY water that I know of is at the San Leandro Marina Park at the turn around. Carry plenty with you!
Turn-around: Marina Park in San Leandro. Several water fountains and a bathroom here.