Guide Michael Walther has spent his life studying local flora and fauna, and he imparts his knowledge during these interesting eco-excursions. Invigorate yourself with an early morning hike to the 763-foot summit of the Diamond Head Crater. Visit magnificent waterfalls during the afternoon rainforest excursion in the Ko'olau mountains. There are several tours to choose from, as well as combination tour packages. You'll experience Hawaii's bird and plant species, waterfalls, rainforests, volcano craters, dolphins, whales and coral reefs. You'll explore with a small group while learning and having fun. Archaeological information is intertwined with the adventure, as well as geology and Hawaiian mythology. A portion of the funds collected are donated to the Nature Conservancy which works to protect many areas of the islands, making a day spent with Oahu Nature Tours a true eco-friendly adventure.