LAX is probably the easiest big city airport to walk out of in the US with the very strange exception of San Diego. There's a freakin' shuttle bus that rides the HOV lane on the freeway to the downtown with a view that would have inspired The Jetsons. It drops you less than a block from the subway which in turn drops you off right at Hollywood and Vine with a large amount of accommodation in a two block radius.
People say "nobody rides the bus" but when you get on one it is packed, service is not bad at all. If you need a cab occasionally, the service is just great.
In movies like Barbie you see people walk from Venice Beach to the downtown, it's a very long walk (15 miles!) but it's a fairly comfortable walk where you won't encounter any difficult obstacles unlike the average American city.