Shafer Butte is an excellent activation not far from Metro Boise - about an hour up Bogus Basin Road will get you there - and another 1.25 miles or so and 700 feet of hiking will gain you the summit proper. Or consider that there is a ski lift a few feet away from the summit - buy a lift ticket and climb a little and earn the bonus points for a "ski" activation during the winter.
Here's a fairly easy SOTA summit not too far from Boise. It has good views from the top and some simple navigation challenges as it's cross country with no trail. This could be a good summit to try out using a GPS - it might help you end up in the right place.
K7ATN and N7LKL activated Washington's Larch Mountain on Saturday, 2/2/13. We hiked in on the forest service road from the west side, starting near the Larch Corrections Center (directions below and find the eastside approach here: https://www.wta.org/go-hiking/hikes/larch-mountain-silver-star.) We were able to drive up the service road quite a ways but hiked the last 1.5 miles with approximately 1200 feet gain. Weather conditions were excellent - sunny and not too cold.
Taylor and I returned to Tumalo Mountain this weekend to score a rare 6 pointer in winter, with a justified bonus. Tumalo Mountain is a strenuous, yet technically easy ascent. The trail up to the summit leaves from the Dutchman Flats Sno-Park, just north of the entrance to the Mt Bachelor ski area on Cascade Lakes Highway. Because this is a popular winter recreation area, the parking area is packed with people looking to snow-machine, ski, and snowshoe to the top.
This is the only 'drive-up' ten pointer in Oregon - but perhaps because it's eight hours from the Willamette Valley it remains a pretty quiet place. It's actually a near drive-up - the walk beyond the gate to the summit and AZ is less than a half-mile. The scenery and silence of this high desert place have made it my favorite spot in the world for more than twenty years with many trips bringing family and friends to see this place.
Diamond Craters is administered by the Bureau of Land Management as an Outstanding Natural Area. This is a great example of Oregon High Desert and although it’s not on the way to anything, it is very much worth visiting. It is about 55 miles southeast of Burns, Oregon.
UPDATE Nov 2022 - http://www.pnwsota.org/blog/ag7gp/2021-january-27/roxy-ann-peak-or-january-2021.
Roxy Ann Peak is a short 1.5 mile 700 foot gain hike just east of Medford surrounded by Prescott Park.
There appears to be a false summit around 5160 feet near the "end" of the trail to Bandera that is about half mile and 80 feet of elevation gain to the actual summitr.
Peak 4980 is an easy activation just south of Mount Hood, Oregon (even if the road is horrid). It has great views (in the right weather) and some wilderness character about it. And there is an old trail that makes access fairly easy.
THIS Mount Scott (Scott, Mount in the ARM) is a volcanic cinder cone (extinct) southeast of Portland, Oregon.