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.
Timber Butte is a practically unknown destination not far from the busy trailhead for Triangulation Peak.
Outerson Mountain is a practically unknown destination very near the very busy trailhead for Triangulation Peak.
Triangulation Peak is a popular summer hike destination with a weekend procession of sandal-wearing hikers, small children and dogs. It's about two miles and 800 feet of gain and has fantastic views of Mount Jefferson and many Cascade Range peaks.
This is a nice hike of 1100 feet on a well-graded trail of about 4.8 miles round trip.
Indian Mountain, north of Mount Hood, is a remote summit with great views of Mount Hood.