• The Hawaiian Trail and Mountain Club has loads of information for new hikers, visitors and serious adventurers interested in exploring one of Oahu's more than 80 trails. The club has been exploring the island since 1910. On the Web: http://htmclub.org.
• Plan ahead and contact the local chapters of the Audubon Society and Sierra Club, which sponsor hikes and bird-watching expeditions.
• Stuart Ball's "The Hikers Guide to Oahu" has trail descriptions and good general information. He has several other books on hiking, camping and backpacking that cover multiple Hawaiian islands.
• The Hawaii State Park website provides details about hikes on its lands. For Oahu, go to www.hawaiistateparks.org/hiking/oahu.
