Any of the piers...Santa Monica...rent a car and hit some markets and drive pacific coast highway

We live on the beach in Redondo Beach year round. March and April are very nice months to visit. Weather generally ariund 18C albeit can be 25C or more at times. Has been a warm Fall/Winter so far with temps up to 32C+! Spring days on beach tend to be lovely if sunny and quiet. You may be alone in sunbathing. Water temps are cold, but perhaps not a cold as the Channel, North Sea, or the Atlantic so could be ok for you. Redondo Beach stores, restaurants, shopping areas, hotels, etc., are always open year-round. We have a very quaint area called Riviera Village that has many sidewalk cafes or restaurants, shops, and it is also just one block from the beach. We have a Pier with restaurants, shops, water activities like whale watching, paddle boarding, sailing, etc.. Adjoining Redondo Beach is the Palos Verdes Peninsula and it has a picturesque 17 mile coastal drive that ends in San Pedro where you can get an expansive view off Gaffey Street of Los Angeles harbor. Along this drive too there are small state parks, some tide pools, couple golf courses with full ocean views, a nature center, and lovely residential areas. Terrenea resort has an open terrace restaurant called Nelson’s on the cliff overlooking the ocean; bit dear but still, great place to have a drink or lunch along that coastal drive. Rent a car, you’ll need it. Redondo Beach is about 15-20 minutes south of LAX. I think you will have a fine time in March! Enjoy!

Dogs are not allowed on the Beach, only on the walking path.

Добрый день! Плавать разумеется можно, но вода весьма прохладная (в любое время года, даже летом). А в октябре я вообще не видел ни одного купающегося. Серферы в гидрокостюмах были.

Yes you can.

Depending on how long your connection is, you can either take the bus, cab or Uber to the beach - I recommend Manhattan Beach and rent a bike and head South towards Hermosa and Redondo Beach (King Harbor) - nice place to walk around. Keep going till the end of the bike path towards Palos Verdes and there you will find a small cafe just to relax and enjoy the beach. It's a more relaxing side to past the time.