Join Richard Neidhardt, Rusty Scalf and Debbie Jo Bird to enjoy close views of waterfowl and occasional bitterns and rails from the boardwalk over Oso Flaco Lake and marsh. Bird two prime willow habitats for wintering warblers. Includes 2-3 miles of slow walking. Moderate. Meet at Oso Flaco parking lot, 3004 Oso Flaco Lake Road, Arroyo Grande. State Parks requires a parking fee of $5.