About 25 volunteers are needed for a city-sponsored Adopt-A-Stream project in Waikīkī. The event, hosted by the U.S. Army Corps of Engineers Pacific Regional Visitor Center, will meet at 9 a.m. at Fort DeRussy above the Army Museum. Must be 13 years and older. Supplies and refreshments will be provided. Volunteers should wear long pants, covered shoes, a hat and sunscreen. Free. Call Garland Ireland, 438-2815.

About 25 volunteers are needed for a city-sponsored Adopt-A-Stream project in Mānoa. The Mālama O Mānoa will meet at 8:30 a.m. at the Woodlawn Bridge. Must be 13 years and older. Supplies and refreshments will be provided. Volunteers should wear long pants, covered shoes, a hat and sunscreen. Free. Call George Arizumi, 988-5069.

About 300 volunteers are needed for an Adopt-A-Stream clean-up, sponsored by the city, in the Mānoa-Pālolo area. The clean-up, which is a collaboration with the Ala Wai Watershed Association and Kaimukī High School, runs from 8:30 to 11 a.m. Meet at the Mānoa-Pālolo drainage canal near the Date Street bridge. Volunteers are needed to remove litter and cut back streambank vegetation along the canal. Must be 13 years and older. Supplies and refreshments will be provided. Volunteers should wear long pants, covered shoes, a hat and sunscreen. Free. Call Karen Ah Mai, 955-7882.

Head to the Waikīkī Aquarium for the 2008 Mauka to Makai Expo, sponsored by the city, Hawai‘i Department of Health and the Waikīkī Aquarium. Watch the moi release next to the Natatorium from 11 to 11:30 a.m. The event will also feature hands-on, educational activities. Free. www.cleanwaterhonolulu.com.

Reef Check Hawai‘ will host its next in-water training and survey on March 29. Volunteer training session on O‘ahu will precede the survey on March 26 & 27. Classes will be held 6:30 to 8:30 p.m. at Windward Community College Hale ‘Imiloa Room 122 in Kāne‘ohe. E-mail krista@reefcheckhawaii.org. Visit Reef Check Oahu March Training

Reef Check Hawai‘i is hosting a training session on March 26 & 27. Classes will be held 6:30 to 8:30 p.m. at Windward Community College Hale ‘Imiloa Room 122. In-water training and survey to follow on Saturday, March 29. E-mail krista@reefcheckhawaii.org. Visit Reef Check Oahu March Training

Reef Check Hawai‘i is hosting training classes on March 26 & 27. Classes will be held 6:30 to 8:30 p.m. at Windward Community College Hale ‘Imiloa Room 122. In-water training and survey to follow on Saturday, March 29. E-mail krista@reefcheckhawaii.org. Visit Reef Check Oahu March Training

Hidden between Waipahu Town and Pearl Harbor, this 70-acre marsh is home to some of Hawai‘i’s endangered wetland birds. Come see these rare birds and explore their special habitat. For ages 6 and older. $14 for parent and child team. Call Pauline Kawamata, 955-0100 ext. 18. www.hawaiinaturecenter.org.

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.