Thanx everyone for the suggestions so far.
I'd intentionally not listed the kind of things I usually shoot because I find I sometimes get in a rut shooting the same kinds of things repeatedly. Leaving it open like this, I'll get ideas from people that I would never have come up with on my own. Although the octagon barn is a must, since I have a growing collection of unique barns I've shot all over the US. The apple orchard and fish market sound really intriguing as well.
As for schedule, we don't have any. Last year we left the Midwest on a Friday with the plan of being in Phoenix the following Friday, Seattle the Friday after that, and back home a week later. (Non)Planning like this gives us lots of time to explore whatever we find of interest along the way.