Join our trail crew to help maintain vegetation, tread and drainage along Yolanda Trail. Meet on the Phoenix Lake dam. If you arrive before 9 a.m., the gate at Natalie Coffin Greene Park will be open to allow volunteers to drive up and park next to the dam. Folks arriving after 9 a.m. or leaving before 2 p.m. will need to find their own parking. Directions from Sir Francis Drake Blvd in Ross: turn west onto Lagunitas Road and drive one mile to the end into Natalie Coffin Greene Park.