Route: MapMyRide. To understand the route better, study Bay Trail Interactive Map, which clearly marks bike trails, bike lanes on regular roads, paved and unpaved roads. Also study Bay Trail Maps #8 and #9.
Traffic: About 24.5 miles are along bike trails and 4.5 miles are along bike lanes on regular roads, which have moderate traffic on weekends. Some sections like San Leandro Marina are likely to have plenty of pedestrian traffic. On the whole, about 70% of the route is free from vehicular and pedestrian traffic, making it a very enjoyable ride.
Climbing: None. Flat throughout.
Bike Trails: There are three sections with bike lanes on regular roads: (a) From San Leandro Marina to Oyster Bay Regional Shoreline, there is a 1.5 mile section along Monarch Bay Drive and Neptune Drive, (b) To the south of Martin Luther King Jr Regional Shoreline, there is a 1-mile section along Doolittle Drive, (c) From Tidewater Boating Center to Sea View Parkway on Bay Farm Island, there is a 2-mile section along High St and Fernside Blvd, going over two bridges. The rest of the route is along bike trails, with no vehicular traffic.
Views: Awesome views of San Francisco Bay, San Leandro Bay, various bridges, marinas and marshlands along the route!
Water stops and restrooms: (a) San Leandro Marina Park (see website and trail map), (b) Oyster Bay Regional Shoreline (see trail map), (c) Martin Luther King Jr Regional Shoreline (see trail map), (d) Harbor Bay Ferry Terminal has a restroom.
Good time to visit? Any time other than sunny days and rainy days. Spring and autumn are ideal.
Notes: Crossing Bay Farm Bike Bridge was tricky for us, when going in clockwise direction. There is a separate bridge for cyclists and pedestrians. We did not see the signs for this bridge in time. It may be easier to cross this bridge in the clockwise direction (going west to east).
Extensions: Yet to write.