Traverse the entire county by bike. Take in views of straits, marshes, and wetlands, then hills, valleys, and open space. And at the end, give your bike a break and head back to where you started by jumping on an Amtrak Capitol Corridor train where bikes are welcome. We suggest cycling northeast by starting in Martinez to avoid strong headwinds.

• Difficulty: Difficult
• Distance: 61 miles
• Type: One Way
• Time: 6 Hours