Hiking is a great way to explore the diverse Hawaii landscape (Big Island, Kauai, Maui or Oahu). Hawaii hikes range from easy to strenuous. Hawaii hikes include short trips to scenic overlooks while others are backpacking trips to more remote areas. Many of the overnight hikes in Hawaii require that you obtain a camping permit, in advance. (Permits can be obtained up to a year in advance.)

Alternatively, there are guided hawaii hiking tours available. An advantage to taking a guided tour is that they can be educational... and you can support the local economy at the same time.

Hawaii Hiking Safety Tips:
leave your itinerary with a friend, including when you expect to return
hike with a friend
stay on the trail
wear sunblock and a hat
don't drink untreated stream water
avoid wearing cotton (hypothermia is a risk in the summer, too)
bring a first aid kit
bring plenty of water
bring a compass and topo map (and know how to use them!)
bring raingear

Check out this "Hiking Safely in Hawaii" brochure.