Leave Portland International Airport around 1:00 PM after collecting luggage and picking up your car. Take I-84 east toward Troutdale, then use the Historic Columbia River Highway where practical; allow 2½–3½ hours to The Dalles, depending on Gorge traffic, construction, and stops. Before departing, check Oregon TripCheck for closures, smoke, rockfall, and wildfire restrictions—conditions can change quickly in September. If smoke or fire activity affects the west Gorge, stay on I-84 and bypass unsafe scenic-road sections. Download the map in advance, keep the fuel tank above half, and park only in marked lots; shoulder parking is frequently ticketed or hazardous.
Your first stop is Vista House at Crown Point, about 30 minutes from the airport via the scenic highway. Spend roughly 30 minutes on the terrace and inside the historic stone observatory, enjoying the broad river panorama. Continue to Latourell Falls at Guy Talbot State Park for a 45–60-minute walk. The lower viewpoint is a relatively short outing, but the trail can be wet and uneven, so wear sturdy shoes. If the scenic highway is closed or smoky, skip the back-road approach and continue on I-84; do not attempt detours around closures.
Continue east to Multnomah Falls, allowing about 45 minutes if traffic and parking are manageable. A timed waterfall-access permit may be required during the busy season; verify the current rule before leaving the airport. Use the designated lot and do not stop on the freeway shoulder. If the lot is full, traffic is backed up, or visibility is poor from smoke, treat the falls as an optional stop rather than forcing it—the safest plan is to continue directly to The Dalles, roughly 35–45 minutes farther east. Check in at The Dalles Inn, a practical downtown base; typical rooms are about $100–180 before tax, subject to availability. For dinner, walk or drive to Celilo Restaurant & Bar in the waterfront hotel district, where regional Northwest dishes and river views make a relaxed finish to the day; budget approximately $25–45 per person, and confirm September hours and reservations before arrival. Expect a full day of driving and walking, with total route distance around 100 miles depending on scenic-highway access.