Just north of Detroit, Oregon are a nice bunch of summits - Peak 4740 is more of an...let's say...adventure. From where I parked it's less than a mile to the top - some on a rough road and some "cross-country" travel.
Tanner Butte is perhaps the most remote SOTA summit in Oregon's Northern Cascades. Despite many resources that point out the trail length at 17 miles, measured from the GPS track it shows up as right at 20 miles round trip, with 4500 feet of elevation gain. You won't see many other hikers on these remote trails.
Lone Pine Butte is on Yakama Nation land and it is off limits to the public for any purpose except by permit from the Yakama Tribal Council.
Simcoe Butte is on Yakama Nation land and it is off limits to the public for any purpose except by permit from the Yakama Tribal Council.
It makes for a very long day (about 17 miles total), but this Wildcat Mountain (WV-046) can also be reached from Huckleberry Mountain via the Plaza Ridge Trail #783 and the Douglas Trail #781. It's also quite beautiful - a stunning ridge hike in the Salmon-Huckleberry Wilderness.
A nice hike through second growth forest will get you to the former fire lookout site on top of Stormy Mountain. You might consider activating Slide Peak, W7W/CH-202 as you'll be passing right by the trailhead for that summit.
A short, steep and rough climb will get you to the summit of Slide Peak.
Red Hills of Dundee HP is a summit on private property with all of the Activation Zone apparently also on private property.
Githens Mountain in the Clackamas River drainage is a short, one mile hike and only about 500 feet of gain. It can be activated along with nearby Tumala (Squaw) Mountain from the same trailhead. Finding the summit may require a GPS, as it's not on the trail and isn't particularly distinct.
Tumala (or Squaw) Mountain in the Clackamas River drainage is a nice walk through the woods of about 2.5 miles RT and about 800 feet of net gain.