Sheridan Peak is on the east side of the coast range, about 23 miles from Carlton, Oregon. Carlton itself is quite out of the way, being about 12 miles east of Newberg. But it's a nice short hike of about half a mile through some nice second growth woods, and the road is paved the whole way! (I.e.: if your GPS takes you to gravel, it's not the right way...)
Palouki (Παλούκι, stake or fencepost) is an easy summit within walking distance of Skopolestown on Skopoles Island. The T1 trail will get you there.
There's also a road towards Moni Sotiros that the trail crosses several times.
Velanidia (Βελανιδιά or oak tree) is a near drive-up near Volos, Greece.
Pente Pyrgoi (Five Towers) is a great hike near Katerini, Greece of about 11km round trip and 600m elevation gain.
Clarks Mountain is just south of Seaside Oregon. The trail is about 1.8 miles of one-way hiking starting at a clearly marked trailhead on the very south end of town on Sunset Blvd.
For anyone heading up to Mount Hood or headed from Portland into Central Oregon, Clear Lake Butte would be a nice stop on the way. It's a well graded and mostly paved forest road, suitable for biking or bringing along those that aren't big hikers. And no one would mind arriving at a classic fire lookout.
Tiger Mountain is in about the middle of the Tiger Mountain State Forest southeast of Issaquah. Access is via a gravel forest road and you may want to use a GPS or track your mileage as any signs may not lead you clearly to the summit.
If you are headed from Portland to Lincoln City, this could be your activation on the way. Or the way back. It's a drive up on a decent dirt and gravel road with the potential for a nice view at the top.
The Pack Forest is operated by the University of Washington, a bit south of Eatonville, Washington. www.packforest.org.
Blue Mounds State Park is an easy drive up summit about 30 miles east of Madison, Wisconsin. It's a state park that has camping, picnicing and two observation towers (one at each end of the summit) that would be great for VHF contacts.
Take County Road F north from US-151. You can easily follow the signs less than two miles to the park. At the summit there is a large loop with picnic areas - the summit proper is at the center of the loop so anywhere would be in the activation zone. There is also a wooden observation tower on the east side of the summit.