Rodeo Lagoon to Point Bonita Lighthouse is a 4.2 mile loop trail located near Sausalito, California that features beautiful wild flowers. The trail is rated as moderate and primarily used for hiking, walking, trail running, and nature trips. Dogs are also able to use this trail.
From the North Take hwy 101 southbound Exit at 2nd Sausalito exit (just before the GG bridge) Bear right onto Alexander ave, proceed back under the freeway Follow Alexander ave .2 miles, turn left onto bunker road From the South Take 101 across the GG bridge Exit Alexander ave, bear right Follow Alexander ave .2 miles turn left onto Bunker road Once you have passed through the tunnel, you will pass a number of historic buildings. Bunker road turns into Mitchell road along the Rodeo lagoon. There is plenty of parking there.
Red trail provided by AllTrails is not an actual trail. It's a narrow path on the side of the road. You can indeed follow it Rodeo Lagoon/Beach to Bonita Lighthouse but don't expect a nature trail--the path is 2 feet from the main road but fairly safe as vehicular traffic is only 25 MPH. I'd recommend just visiting Bonita by car then driving to Rodeo Lagoon/Beach and hiking the Coastal trail which starts at the parking lot/restroom of the beach and leads to all the abandoned WWII bunkers/batteries.