As far as the larger LA area goes, it's a few hours from Vegas, next to the beach, Santa Barbara and San Diego next door. Access to various Mojave type deserts and national parks (Joshua Tree is amazing). Big Bear / mountains nearby. Various price points of housing, anything from affordable-ish family homes to expensive upscale condos (downtown) and ridiculous mansions (Hollywood hills, Malibu, Belair etc). Great for all stages of life, whether you're young and want to mingle, or have a family and want to live somewhere safe (Pasadena, OC). Access to decent UC schools. Absurd amount of entertainment all day every day for whatever taste you have. Food from every corner of the Earth. Ethnic diversity. Major airport next door. If you're into fashion, arts, cinema, music, tech, real estate, science, there's a place here for you with that interest. Tons of people from all walks of life. Oh yeah, shorts and t-shirt weather all year round.
Only big downsides are commuting and cost of living. Also homeless everywhere unless you're locked up in a suburb, but not as bad as SF since they stick to certain areas. Skid Row is both fascinating and terrifying to visit.
Please don't come here though, rent is going up as it is.