Nearest town: Visitor Center in Fremont, CA; Environmental Education Center in Alviso, CA Region: South and East Bay Marshes Park website: Link here Handy Directory of Trails: Link here Best time of year to visit: Year round Features of the park: The entire refuge is pretty sprawling; each individual public access point has its own highlight; however, they all offer opportunities to get to know about the variety and diversity of wetland ecosystems. Fees: Most have none, but some of the parks that are collaboratively run with other agencies do charge a fee, such as Coyote Hills.