Hauk Butte is a 9.5-mile RT hike with ~2000 ft gain located Northeast of Dog Mountain and Augspurger Mountain north of the Columbia River. Reaching the summit is possible entirely on logging roads, which go right up to the exact SOTA summit. At the summit, you are surrounded by trees on each side of the road as the summit has not yet been logged. This came in handy when I activated during 20-30 mph winds: the trees made a good wind break.
Underwood Mountain is a 2 pt summit Northwest of Underwood, WA across the river Northwest from Hood River Oregon. The start point is about 4.5 miles off of highway 14. It is an easy 3 mile hike to the summit with 1400 ft elevation gain on forest roads closed to motor vehicles. There is a short 250 foot doable bushwack to the summit. It would be a very feasible mountain bike activation.
NC-066, in my head named "Souther Saddle" (even though it's not part of a saddle pair), was a nice bike ride into Stimson forest land. This peak forms the lower point of a triangle between South Saddle NC-002 and NC-065, commonly a paired activation. One could easily do both NC-065 and 066 in a day, provided enough time to hike or bike this route. There are also a number of other nearby peaks on the way in/out of the forest area that could be paired if you had time in the day.
Should you want to do this peak, here us the short version. Note that the long version is a cautionary tale.
Get yourself to Henry Hagg lake. Proceed around the lake until you find Scoggins Valley Road. Turn west here and proceed up the road. Note that you bear left almost immediately to stay on Scoggins Valley Road. After about two miles you will come to a gate. There is parking within sight of the gate.
Cougar Mountain is an easy drive up near Seaside, OR. Or is it?
The conundrum comes because of two gates. Both were open when I went up, neither had signs, not even the seemingly mandatory warning about closing at any time. I rolled the dice this time, but now that I know what's up there I'll bring a bike if I come back.
Here are the directions which work regardless of your mode of transport. That includes the carefully driven passenger car, although this route had less than the normal amount of potholes, so not so carefully? Watch out for log trucks anyway.
Summit 5230 is located 23 miles (as the crow flies) South of Pendleton, OR. If you have the right vehicle and can tolerate a long bumpy ride in, this can be a drive up summit. It would make an excellent mountain bike-based activation. I would not attempt this summit without a GPS.
Tower Mountain really does have a tower on it. The 92'-tall Aermotor steel lookout tower was built in 1935. It is still standing and accessible today. Your level of enjoyment with the activation will likely increase if you are able to use the tower in your activation. This peak is the highest and most prominent point in Umatilla County, Oregon, but the summit is tree lined so getting up the tower gets you above the trees.
Wards Butte is near Cottage Grove, Oregon and can be accessed from the south by I-5 exit 170 and from the north by exit 174. (Not to be confused with Ward Butte-W7O/CC-082.)