I've been to S10 (Lake Chelan, WA) a few years back. Nice airport with
a hill at the NE side of the airport. Should have no problem getting
in and out though. Ground transportation could be a problem. It's a
few miles out of the town.

If you come up from CA, try get to the east side of the Cascades
somewhere near Klamath Falls. The weather is usually nicer and drier.