Lecture TBA, Humpback Whale Awareness Month Contest Awards begin at 6:15 p.m. at the Hanauma Bay Nature Preserve Theater. Free. (Parking free after 5:30 p.m.) 397-5840.

“Talking Trash! Marine Debris and Wildlife Entanglement” by Carey Morishige of NOAA’s Marine Debris Program at the Hanauma Bay Nature Preserve Theater, Free. (Parking free after 5:30 p.m.) 397-5840.

“Whales in Crisis,” a documentary produced by National Geographic at the Hanauma Bay Nature Preserve Theater. Free. (Parking free after 5:30 p.m.) 397-5840.

“Understanding Strandings, Marine Mammal Beaching” by Dr. Kristi West, Professor of Biology, University of Hawai’i, at the Hanauma Bay Nature Preserve Theater. Free. (Parking free after 5:30 p.m.) 397-5840.

Spend an afternoon discovering the joys of a fresh water mountain stream. Design your own boat, feed a Tahitian prawn, and dunk your toes in miniature bubbling waterfalls. For ages 5 and older. $14 for parent and child team. Call Pauline Kawamata, 955-0100 ext. 18, www.hawaiinaturecenter.org.

The Kawainui and Hamakua Marsh Complex was designated a Ramsar Day 2008. These wetlands are important as habitat for Hawai’i’s endangered waterbirds, significant as cultural sites and valuable as flood control features for Kailua town. Learn more about these wetlands and current efforts to promote wetland conservation from talks, tours and exhibits offered as part of World Wetlands. Free. Call Martha Yent, 587-0287.

Focus Hawai‘i, a climate change teach-in, is a fast-paced, interactive forum focusing on climate change science, predictions and solutions for Hawai‘i. Hear from experts in short, 7-minute presentations at the William S. Richardson School of Law, 2515 Dole St., Classroom 2 in the courtyard. Presenters include Chip Fletcher, Charles Burrows, Jeff Mikulina and Sen. Ron Menor. Moderated by Denise Antolini. This is a carbon-neutral event. Desserts and drinks provided. 956-6238, www.evolutionsage.com.

Spend a morning investigating hermit crabs and their housemates through storytelling, art and up-close encounters with these crusty creatures. Adults and their 4- to 6-year-olds will meet left-handed, elegant and anemone hermit crabs and then create a crab of their own design. $16 adults and child team, $12 for members. 440-9007, www.waquarium.org.

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.

NOAA and the Waikiki Aquarium invite teachers to an evening under the stars. NOAA’s Ocean Explorer’s curricula will be highlighted and representatives from various marine education organizations will have tables set up as well. Refreshments provided. Free for educators and a guest. To register, call 440-9011 or e-mail reservations@waquarium.org.