I used (over used) my Singh Ray filters, creating color, contrast and light separation. The Blu 'n Gold filter creates blues and golds, the A13 adds a bit of red-pink warmth, the Sunset Strip adds a layer of gold-pink to the clouds and sky, the split neutral density filters hold back some of the sky brightness to keep the darker foreground and the brighter sky in better balance, and the color intensifier ups the earth tones.
I know, I know. You can use too much makeup, right? Ahh, it was the last night of my first ever photo trip/visit to California, and I perhaps got carried away.
Use a tripod, the sun will set quickly and long shutter speeds will be required.
Thanks for looking,