The lagoon and the several city parks and bike paths along the lagoon offer an impressive array of recreation opportunities, including walking, biking, picnicking, sunbathing, bird watching, swimming, fishing, boating, and other water sports. Recreational use of Marina Lagoon is administered by the Department of Parks and Recreation. Parkside Aquatic Park, located at the foot of Seal Street, offers boat launching, swimming, a sandy beach, concessions stand, and restroom facilities. There is no lifeguard on duty. The Harbor Patrol provides enforcement of regulations and boat inspection assistance and first aid, from Memorial Weekend through Labor Day.

Water samples are sampled each week at Lakeshore and Parkside Aquatic Park beaches for concentrations of indicator bacteria. If concentrations of indicator bacteria exceed State or County standards, the area is posted to warn users that they may become ill if they engage in water contact activities in the posted area.

For more information about Beach Monitoring Program, visit the County's website.