Reef walk: Waikiki Aquarium staff talk about reef walking safety, conservation and the natural history of marine life, 7:30 to 10 a.m. Saturday. Costs $8 adults, $7 children. Register by mail. Call 923-9741.
Plant care: Free gardening classes on how to select a tree for your yard, plant it and care for it, 9:30 to 11:30 a.m. Saturdays in May, Ho`omaluhia Botanical Garden. Includes a session on composting. Work clothes and shoes, bug repellent and rain gear. Call 233-7323.
Pineapple Festival on Lanai: Hula, tennis, fishing competition, amusement rides and a pineapple-eating contest, 10 a.m. to 10 p.m. Saturday, Dole Park. With Kapena, Dennis Pavao, Sunway, Aura, Hawaiian Time and others. Call 565-7600, Lanai.
Two Steps Up Country Dance Party: 5 to 10 p.m. Saturday, Pali Clubhouse and Koolau Ballroom, Pali Golf Course, Kaneohe. Admission $7. Call 262-0869.
Sugar Cane Run & Roll: Waikele Center's benefit race for the Hawaii Centers for Independent Living is open to runners, walkers, in-line skaters, wheelchair athletes and nonathletes, Sunday. Skaters demonstrate their creativity, not speed, during the Family Fun Skate. Entertainment by Rolando Sanchez. Call 676-5656 or 537-1941. No registration May 5.
Swing Dance Party: 6 to 9 p.m. Sunday, Ala Wai Golf Course Palladium. Admission $4. Call 599-7740.
Lei garden planning: Help lay the groundwork for a community lei garden, 10 a.m. Tuesday, Ho`omaluhia Botanical Garden, Kaneohe. Call 233-7323.
"Skateboarding Tracks" discussion: Hawaii lacks "tracks" such as those designed by Ken Wormhoudt in Santa Cruz, Palo Alto and other California cities. Wormhoudt, a landscape architect, will discuss his work and how people can have a track built in their community, 7 to 9 p.m. Thursday, Kailua District Park. Call 808 Skate at 263-0808.