WAIKIKI AQUARIUM DOCENTS — Free training for Edge of the Reef volunteer docents, Sept. 4-20 (6:30-9 p.m. Tuesdays and Thursdays, 9 a.m.-noon Saturdays). Call 440-9020 or visit www.waquarium.org.

HALEAKALA LEARNING TRIP — Join the Friends of Haleakala National Park for a service learning trip Sept. 1-3, with a two-night stay at Holua Cabin. Volunteers work four hours a day and learn about the park's ecosystems from park staff; $15. Call 808-876-1673.

HONU GUARDIANS — Educate residents and visitors about turtle viewing at Laniakea by joining NOAA's Honu Guard program. For details, go to www.fpir.noaa.gov/PRD/prd_volunteer_opps.html.

SIERRA CLUB BEER NIGHT — Hear presentations on environmental topics and how to get involved, at Cassis, 66 Queen St.: 5:30-7:30 p.m. Sept. 26, curbside recycling with Betty Gearan.

THURSDAY HELPERS — Kaua'i's Limahuli Garden & Preserve seeks volunteers to restore native forest on Thursdays, 8-11 a.m. Call Lahela Correa, 808-826-1053, or Lea Taddonio, 808-332-7324, ext. 228.

CHUN'S REEF CLEANUP - Join Adopt-A-Beach Hawaii and Save The Sea Turtles International at noon Saturday for a Chun's Reef Beach highway and coastal cleanup. Trash bag, gloves and purified water provided; bring hat, sunscreen, beach shoes. Meet at 61-529 Kamehameha Highway, Hale'iwa. Call 637-2211 or see www.seaturtlesinternational.com.

ARBORETUM WORK PARTY — Lyon Arboretum in Manoa holds a volunteer work party at 8 a.m. on the first Saturday of each month. Meet in parking lot, prepared for rain and sun; closed-toe shoes, bug repellent, hat, gloves recommended.