Open year-round, the forest trails are popular with mountain bikers ... There are dangers related to another one of Hawaii's most iconic hikes — the Kalalau Trail on the the island of Kauai.

This out-and-back hike starts at the Hawaii Nature Center ... This 5.2-mile loop trail in the Pūpūkea Forest Reserve is a combination of paved, gravel and dirt roads and single-track trails.