Any of the previous recommendations sound great and some are on my list. I have been to the Seattle/Mt. St. Helens/Olympic National Park and it was great. Lots of variety there and tons of great photo-ops. Another area you might consider is Montana (Glacier National Park). We did the "Going to the Sun Road" through Glacier a number of years ago and it was awesome. Really like to go back again (now that I'm more into photography...).

Where are you coming from anyway? Might help with recommendations to know where home is for you.

Stephen