Little Tamarack Mountain (W7O/NE-137) makes a nice activation destination in north-central Oregon as it's located in the Umatilla NF near a Forest Service rental cabin/lookout with two other summits nearby, including Ng Knob-4820 (W7O/NE-147) and Happy Jack Ridge (W7O/NE-139).  I rented the cabin for two nights.  Activated Little Tamarack on the first day, then bagged the other two summits the next.