Makiki Valley Loop Trail

This guide to Makiki Valley Loop Trail in Honolulu follows three joined trails, Maunalaha, Makiki Valley and Kanealole, and traces why nearly every tree lining them, eucalyptus, ironwood, Norfolk pine, arrived from somewhere else entirely. It stops at the Hawaii Nature Center, teaching visitors since 1981 that this jungle-like ridge is really a forest of transplants. Listen for the stream underfoot: the loop crosses it five times.