I went for a ride on Mulholland Drive today and saw some great scenery. Yep, that's L.A. (view to the valley - Map) I am not sure if everyone knows how beautiful it is (well to me at least). Of course, it is a very different town than Madrid and you better have transportation - but that is really a lot of the fun.
In Madrid, I love to not have a car / bike. Walking, the metro, is fine with me. Those methods of transportation are part of the city. And in L.A., driving is part of the city.