Waikiki Aquarium naturalists guide this 5-mile nature walk along one of O’ahu’s last shoreline wilderness. This rugged and beuatiful coastline features diverse coastal ecosystems, unique geology and a fascinating history. See whales and nesting Laysan albatross. For adults 16 years and older. $10 per person, $8 for members. 440-9007, www.waquarium.org.