The Giant Trees Trail (also called the Sacred Trees area or Shenmu zone) winds through a section of the ancient cypress forest near Shenmu station, passing some of Alishan's most impressive surviving old-growth trees. Many of the trees are hundreds of years old — the forest was already ancient when Japanese foresters began logging it in 1906 — and the survivors are enormous: trunk circumferences of five to eight metres are not unusual.
The trail is accessible on foot from the resort village (about 40 minutes) or by the Shenmu branch railway. The boardwalk paths are well-maintained and accessible. Early morning visits avoid the worst of the crowds, and in the mist the ancient trees have a particular atmosphere. Plan 1.5–2 hours for a relaxed walk through the main circuit.