For day tripping, stay on the OR side on US 30 (not for RV's). Check out these brochures:
WaterfallsHighway historyState ParksAAA Auto TourIf you want to stay in the gorge, check out Ainsworth SP. 40 FHU sites. Access is from the interstate so you don't have to drive on US 30.
Ken & Allison
2 Camping Cats (1 diabetic)
1996 4Runner, TRD Supercharger, Edelbrock headers
2007 Fleetwood Arcadia, Honda EU2000i
4 mountain bikes, 1 canoe, 4 tents, 8 sleeping bags, 2 backpacks
(You get the idea!)