On one of those freakishly clear days we get every now and then, drive up to the old Nike missile base West of the 405 on Mulholland. Panoramic 360 views of LA and the valley. Sunset on a clear day is pretty incredible. Lots of mountain bike trails start from there.
Take Mulholland as far as you can go west. If you start going down into houses you've gone too far or made a wrong turn.
I'm curious to know if anyone knows if you can get up to the top of Mt. Baldy or Mt. Wilson (or something similar) at sunset? On one of those rare crystal clear days, I imagine you could see the whole LA Basin, which would be pretty spectacualar.