I hope you like LA. Are you staying at a hotel or with relatives? My sister used to live here alone, but last year I moved here with my family too. I'll be honest, I fell in love with the local beaches, especially when I rented a yacht on GetBoat
https://blog.getboat.com/business-travel/best-beaches-in-los-angeles/ for a mini-cruise along the coast to see everything. By the way, I saw some great tips on visiting beaches that I didn't know about before. For example, that you should bring comfortable shoes, as most beaches are rocky.