- This 1.6 mile moderately difficult forested trail starts above Polipoli Springs Sate Park on the Skyline switchback at 6,500` elevation and works down the crest of the southwest rift of Haleakala past the Plum Trail junction to the lower forest reserve boundary at 5,600` elevation. Spectacular views extend in all directions. The trail passes alternatively through rough cinders, native scrub brush, grassy swales and a planted forest of pines, eucalyptus and other tree species. The trail joins the end of the Polipoli Trail leading back to the park 0.3 mile from the top. At 1.2 miles the trail joins the Plum Trail. Moreover, the Haleakala Ridge, Polipoli, Redwood and Plum Trails form a loop worth hiking (3.5 miles).