Park at Glenmacnass Waterfall head west for Tonelagee to the south of the heart shaped lake, take in views on Tonelagee, walk the ridge north over stoney top, keep going veering west to Mullaghcleevaun (great views to West and North), then East to Carrigshouk, down onto military road and downhill to car park.
Give yourself 5-6 hours. If you have longer go from Mullaghcleevaun to Sally Gap before heading south along the road.