RPV (Rancho Palos Verdes, also called Palos Verdes)
Also, my friend's DH works in El Segundo and they live in Pacific Palisades. So that means that you could do PP, or Santa Monica, or Venice, or Marina del Rey. PP is family-oriented and I wouldn't recommend it for a someone without kids. Venice is quirky and Marina del Rey has a lot of condos. Santa Monica is vast with different areas for different needs. There is also Brentwood.
I agree with PP you should rent first, then explore. Don't dive in!
So if you want walking (and assuming no kids), look at the areas of Santa Monica around 3rd St. Promenade. We used to live just off 7th and Montana Ave. pre-kids and we could walk to both Montana (shops and restaurants) and 3rd St. Promenade (lots of shops and restaurants), and to the bluff there for a beautiful long walk looking at the ocean.