Looks like you had a beautiful day. I really enjoyed that ride when I took it. We went over four peaks, then took a short trip down 188 just past the bridge and drove to the closed end of Apache Trail.
Go north on N. Usery Pass RD, then turn right onto N. Bush Hwy, then turn right onto Beeline Hwy (hwy 87). Look for sign for 4 Peaks, turn right onto Cline Cabin Rd (gravel road). There is a parking lot for staging trailers. Look on google maps for OHV parking 4 peaks.