Near the the end of Pipeline Trail #668, there is an intersection, if you go right you'll head to Seven Bridges on Seven Bridges Trail #622. If you go left it takes you to Kineo Mountain Trail, which has a nice flow with a few climbs. This trail has a great set of rolling hills that sends you airborne almost every time.
Keep an eye out for hikers and people traveling uphill, they have the right of way. At the end, you'll see the forest open up and two sharp switchbacks are laying in the descent with nearby access to Upper Buckhorn #667.