Southeast of Kahului from the summit of Haleakala on Maui, the Skyline Trail is a 16 mile dusty doubletrack descent from 9,900 feet. It runs southeast from the border of Haleakala National Park down through Kala Forest Reserve into the Polipoli Spring State Recreation Area. After starting on a dusty doubletrack through misty, moon-like landscape high above the clouds, the Skyline Trail leads to the Mamane Trail which is a 2 mile long singletrack winding through lush and foggy forests of cypress, pine and eucalyptus. The Mamane Trail is followed by an eight-mile road descent. Overall, a circuit can be formed with these trails and roads which is known as the Waiakoa Loop.
To get to the Kula Forest Reserve area, take SR37 (Haleakala Highway) approximately 14 miles from the Hana Highway to Waipoli Road, backtracking a bit on Route 377.
Another way is to follow the signs to Haleakala National Park from 37 to 377 but keep going for several miles after you see the 22 Miles to Crater sign.
About 7 miles up Waipoli Road,the paved portion ends up giving way to easy dirt road biking to the trails and upper roads. Park along the road after crossing the cattle guard by the Kula Forest Reserve and Boundry (hiking) Trail sign.
Overall, Skyline Trail is the 5th most popular mountain bike trail of all 22 mountain biking rides in Hawaii.