What is the longest, continuous beach walk you can complete in LA?

I wanted to walk from Santa Monica to Playa del Rey, but it looks like the beach gets cut off at the marina? Idk why I have a desire to do this lol but was hoping to get reccs from anyone that has attempted a multi city beach walk. No preference for where along the coastline, I just want to be able to walk along the sand/water. TIA!