State Route 90 is a state highway in the U.S. state of California that consists of two unconnected pieces in Greater Los Angeles.

Marina del Rey is an unincorporated seaside community in Los Angeles County, California, with an eponymous harbor that is a major boating and water recreation destination of the greater Los Angeles area. The port is North America's largest man-made small-craft harbor and is home to approximately 5,000 boats. The area is a popular tourism destination for both land and water activities such as paddle board and kayak rentals, dining cruises, and yacht charters. Land activities include bicycling on several bicycle paths, walking paths along the waterfront, and birdwatching (birding). Wildlife watching opportunities include California sea lions and harbor seals. Dolphins and whales occasionally visit the deeper waters of harbor. This Westside locale is approximately 4 miles (6.4 km) south of Santa Monica, 4 miles (6.4 km) north of Los Angeles International Airport, and 12.5 miles (20.1 km) west-southwest of Downtown Los Angeles.