Crater Peak is a pleasant trail hike in Crater Lake National Park. It's been covered in a trip report by Phil-NS7P, so this should be considered a supplement. It's about 6.4 miles round trip, and although the sign at the trailhead says 765 feet of gain, that's net - the gross is more like 1,364 feet with all the ups and downs along the trail.
One of the many summits named "Lookout Mountain" in Oregon - this one is west of Sunriver and is a near drive-up with a half-mile road walk and about 200 feet of gain. It's also easy to reach by following GPS map directions.
Browns Mountain, west of Sunriver, despite being pretty close to a paved road, was a tough bushwack for Roland-K7FOP and I, as we pursued several "shortcuts." So we recommend walking about 2.4 miles on forest roads, and a final steep ascent of about 1/10 mile. Total is about 900 feet of gain. If there's a better way to get to the AZ, please write up an updated trip report.
Sisters View is 1.8 miles RT hike and about 600 feet gain.
Depending on how far you choose to drive, Gray Butte will be a 1.4 mile road hike (OW) with about 1200 feet gain. There's another summit that could add another two points with 1.8 miles of hiking. Although I was thinking that the road might require high clearance, a Prius drove up after me - so know your vehicle.
Pine Ridge is a steep hike of a little less than one mile (OW) and 800' vertical, close to Gray Butte-W7O/CE-180 and Grizzly Mountain-W7O/CE-135 so you might consider doing other peaks in the area. Do not confuse this "Pine Ridge" with the W7O/CE-157 "Pine Ridge" about 50 miles to the south.
Lookout Mountain is a lovely hike of about 1.75 miles (OW), close to Round Mountain-W7O/CE-045 so you might consider doing both of those peaks. Note that there are MANY Lookout Mountains - this one is east of Prineville.
Round Mountain is a road hike of about 2 miles one-way and 1000 feet of gain. It's close to Lookout Mountain-W7O/CE-039 so you might consider doing both of those peaks.Note that there are FIVE Round Mountains in Oregon, with one in CE near Lakeview. This is the Round Mountain east of Prineville.
Ochocco Mountains High Point could be considered a drive-up summit...for some vehicles. Although most of the way is paved, your low clearance passenger vehicle will have problems with the road in places where you can't turn around. A quarter mile of walking to the summit is recommended - it's a neat spot.
About 30 miles east of Prineville on Highway 26, turn north on Forest Road 27. This may be described as Grant Springs Road, or Summit Road, depending on your resource. This is near milepost 49.
One of our favorite summits in France, you can visit the winery and then hike up the road to the chapel and play radio! You can even stay overnight in accommodations at the winery. The hike is all of 1km with about 90m of rise. At the chapel there's a bench and some shade - a perfect spot to activate after wine!
It's perhaps easiest to find the summit by finding the winery: Chemin Notre Dame des Anges, 84570 Mormoiron. That's about an hour east of Avigion.