The guys over on NWB are trying to put together another Multnomah Falls cruise. Current favorite is October 6th.
Basically start near Troutdale, OR. Take the old highway up to the falls, then stop for lunch, then continue up river to teh fish hatchery and the bridge of the gods. Hit the visitors center, and could prolly hit the bonneville dam visitors center on the way back.
Here are some pics from last year. Its a NWBombers thread:
Multnomah Falls - BOMBER Board
More discussion at Northwest Ford Diesel
(ford club) and Northwest Bombers