NATIONAL FISHING WEEK KEIKI FISHING DERBY, 10 a.m.-2 p.m. June 5, Ho'omaluhia Botanical Garden, Kāne'ohe; prizes in age and other categories; free (family members/ friends not entering derby welcome to fish along shoreline); requirements: hand-held poles, barbless hooks and non-live bait (recommended insect repellent, water and lunch); youth must be accompanied by adult (no pets); information: 233-7323.
COMPOSTING CLASS, sponsored by city Board of Water Supply and Friends of Halawa Xeriscape Garden, including a take-home pre-cut, 15-gallon compost drum, 10 a.m.-12 p.m. June 12, at the garden, Hālawa Valley, Central Park Industrial Area; $5; registration required, 748-5363, by June 10.
TWILIGHT SUMMER CONCERTS 2010, and chance to stroll the gardens, 4:30-7 p.m. Thursdays, through July 29 (upcoming: Army Jazz Combo, June 10, and Celtic Pipes and Drums, June 17; Pacific Fleet Band Woodwind Quintet, June 24), Foster Botanical Garden; free; (picnics, blankets, lawn chairs allowed; information, 522-7064.
'AIEA ORCHID CLUB SHOW, 9 a.m.-8 p.m. June 11; 9 a.m.-6 p.m., June 12; 9 a.m.-3 p.m. June 13, 'Aiea Elementary School; $2 donation; information, 247-3345.
PACIFIC BONSAI CLUB PLANT FAIR, 9:30 a.m.-1:30 .m. June 13, Kīlauea Recreation Center, 4109 Kīlauea Ave.; free admission; 737-7156.
PRE-SCHOOL NATURE HOUR, (Third Tuesdays monthly), with stories, crafts and nature hikes; 10:30 a.m. June 15 (topic: seeds), Ho'omaluhia Botanical Garden, Visitor Center; brown-bag lunches encouraged (recommended: walking shoes, insect repellent, raingear); free; information, 233-7323.
"THE ART OF BONSAI, Windward Community College class by Walter Liew, 6-8 p.m. June 22-Aug. 10, WCC, Hale Kuhina, room 115; $80 ($15 lab fee); registration, 235-7433.
SECOND SATURDAY AT THE GARDEN, a series of events offering a chance to stroll the garden and learn about tropical gardening from certified Hawai'i master gardeners and center volunteers; 9 a.m.-noon, second Saturdays monthly; Pearl City Urban Garden Center; free; www.ctahr.hawaii.edu/ougc, 453-6055.
NIAULANI NATURE WALK, guided tour through an old-growth forest; 9:30 a.m. Mondays; Volcano Art Center's Niaulani campus, Volcano Village, Big Island; 808-967-8222, http://www.volcanoartcenter.org.
TUESDAYS AT KANAHĀ, weekly beach cleanup and plant maintenance, coordinated by Community Pride at Kanahā Beach Park, Maui, 8-10 a.m. Tuesdays, at the park; Valerie Vines Magee, 808-264-1454.
MĀNOA HERITAGE CENTER, discover an old Hawaiian heiau and native plants while learning Mānoa Valley's history; 9 a.m.-4 p.m. Tuesdays-Saturdays; Mānoa Heritage Center; $7 general, $4 seniors and military, students free; visits and tours by reservation only: 988-1287, http://www.manoaheritagecenter.org.
HO'OMALUHIA PRESCHOOL NATURE HOUR, for ages 3-5, with stories, songs, crafts and nature hikes (optional picnic lunch); 10:30 a.m., third Tuesday monthly; from visitor center; recommended: walking shoes, insect repellent, rain gear; information, 233-7323
WEED & POT CLUB, at Maui Nui Botanical Garden, 8:30-10:30 a.m. Wednesdays, 150 Kanaloa Ave., Kahului, Maui, to do beautification and maintenance work; tools, gloves, drinking water provided; wear shoes; 808-249-2798.
BOTANICAL DRAWING AND PAINTING, rendering of plants, flowers, seeds and pods from the garden; 9:30 a.m.-noon Wednesdays, Ho'omaluhia Botanical Garden, Kāne'ohe; recommended: No. 4 round brush, Bristol paper, watercolor set or pencils; free; reservations, 233-7323.
MAKIKI FOREST RESTORATION PROJECT, volunteers needed for Makiki Watershed Awareness Initiative forest restoration, 9 a.m.-2 p.m. fourth Saturday of each month; weed, pick up branches, plant, water and fertilize; wear long pants, long sleeves, shoes or boots, gloves, insect repellent and bring water and lunch; meet at Makiki forestry base yard above new Hawaii Nature Center; 973-9782.
FREE GARDEN MULCH, 9 a.m.-3 p.m. Saturdays, Hālawa Xeriscape Garden, 99-1269 Iwaena St.; www.boardofwatersupply.com, 748-5041.
HO'OMALUHIA FAMILY CATCH AND RELEASE FISHING, 10 a.m.-2 p.m. Saturdays and Sundays, yearlong, Ho'omaluhia Botanical Garden, Kāne'ohe; recommended: walking shoes, insect repellent, rain protection, barbless hooks and fishing gear; free; reservations, 233-7323.
LYON ARBORETUM WORKDAY, weeding and garden maintenance with arboretum grounds crew, first Saturday monthly; information: 988-0456.