Monte Carlo is a nice trail to an open summit near Underwood, WA. This appears to be the shortest and easiest way to Monte Carlo - a hike of less than a mile and about 800 feet gain.
From Highway 14, take 141A about 4.2 miles, past the junction with 141, to turn left at Northwestern Lake Road that turns into Nestor Peak Road. Then 6.3 miles north on B-1000 (AKA, Nestor Peak Road), then sharp right onto B-1500 for 1.0 miles, and second right onto an unnamed road (B-1500?) for 1.4 miles. The roads all appear to be Priusable, although the last has high middle vegetation. The trailhead on the left is unsigned and Very Obscure (near 45.8694, -121.5794). There is a slightly wider spot to park there. From here, the Monte Carlo summit is about 0.8 miles to the east on a sometimes steep trail.
The summit has a large 'meadow' surrounded by trees for antennas. There could be 2m FM coverage into Portland/Vancouver, but you'll need a good antenna.
OPTIONAL TRAVERSE
Monte Carlo and Monte Cristo Range HP could be two summits to do as a ~7.4 mile, ~2300 foot net gain traverse with two parties and a vehicle exchange. You could also just drive around to each short trail - but you'd miss the lovely ridge walks of the Monte Carlo / Monte Cristo trails.
Trail #52 Monte Carlo
https://www.fs.usda.gov/recarea/giffordpinchot/recarea/?recid=31836
Trail #53 Monte Cristo
https://www.fs.usda.gov/recarea/giffordpinchot/recarea/?recid=31838
Buck Creek Trail Map - DNR (includes entirety of the traverse)
https://www.dnr.wa.gov/publications/eng_rms_buck_ck_all.pdf
