Wiliwilinui hike: Walk an old dirt road along a ridge above Waialae Iki with Betty Nakamura, Saturday. Three miles, three hours. Costs $5. Call the Hawai`i Nature Center at 955-0100 for details.
Bird Walk: With Sheila Conant, 8 to 11 a.m. Saturday, Lyon Arboretum. Costs $9. Call 988-7378.
Waikakalaua hike: 9 a.m. Saturday, with Hawaiian Trail and Mountain Club. Costs $2. Call 623-2427.
Make a lei for Mother's Day: Bring flowers from home and gather some greenery from Kahana Valley State Park during a lei workshop 9 a.m. to noon Saturday. The Kahana Ohana will teach kui, kipuu, hilo hilo, wili and haku lei-making. Costs $2. Call 237-8858. Potluck lunch.
Contra dancing: 7 p.m. to 10:30 p.m. Saturday, Church of the Crossroads, Weaver Hall. Live music. Cost: $5. Call 834-0695.
Israeli dancing: 7 p.m. to 10 p.m. Saturdays, University of Hawaii at Manoa, Studio 2. Call 623-3603.
Halawa Ridge hike: 8 a.m. Sunday, with Hawaiian Trail and Mountain Club. Costs $2. Call 845-4691.
Waikiki Aquarium: "The State of the Reef" 7:30 p.m. Wednesday, aquarium foyer. Donation:$4. 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.
Pali Twirlers square dance: 7:30 to 9:30 p.m. Thursdays, Kailua Recreation Center. Call 254-2333.
Sports Acrobatics Hawaii: Hawaii Highflyers Trampoline Club for adults and kids, 4 and 5 p.m. Mondays and Wednesdays, McCully Recreation Center. Free workouts for experienced bouncers. Call Karl Vorwerk at 949-3747. Intermediate tumbling with Dick Criley 8 p.m. Mondays and Fridays. Call 596-9168. Waikiki Acrobatic Troupe meets 4 p.m. Sundays at the beach by Kapiolani Park Bandstand; free workout at UH Studio Four 8 p.m. Wednesdays. Call Don Heafner at 536-7205.
Free hike to Diamond Head: Meet the Clean Air Team at the Honolulu Zoo entrance, 9 a.m. Saturdays. Three miles to the top. Call 948-3299.
Hash House Harriers: Aloha group meets for social runs 3 p.m. Saturdays. Call 948-AHHH (948-2444). Honolulu group meets 5:30 p.m. Tuesdays. Call 948-HASH (948-4274).
Hawaii Israeli Recreational Dance: 7 p.m. Saturdays, Studio 2, UH-Manoa Athletic Complex. Instruction the first hour. Donation $1. Call 623-3603.
Honolulu Marathon Clinic: Free training runs with Jack Scaff and staff, 7:30 a.m. Sundays, Kapiolani Park Bandstand. Call Norm at 247-4957. No meetings on three-day weekends.
International folk dancing: Includes Bulgarian, Greek, Rumanian and Israeli dances, 7 to 9:15 p.m. Sundays, Makiki District Park. Donation. Call 239-7078.
Line dancing: 9:30 to 11 a.m. Tuesdays, Waikiki Community Center. Costs $3. Call 923-1802.
Scandinavian dancing: 7 to 9 p.m. Wednesdays, Ala Wai Golf Course Clubhouse. Instruction available. Free. Call 922-0793 or 955-2577.
Scottish country dancing: Instruction available, 7 to 9 p.m. Wednesdays, Moiliili Community Center, Room 305. No partners necessary; wear soft-soled shoes. Call 737-1897.
Nature Conservancy hikes: Guided hikes offered bimonthly at Honouliuli Preserve, home to more than 45 rare native plants and animals. Donations accepted. Call 537-4508 ext. 252. Hikes will be April 28, May 11 and 19, and June 8 and 22.
Honolulu Hash House Harriers: Social running group, 5:30 p.m. every Tuesday. Call 948-4274. Aloha Hash House Harriers, 3 p.m. every Saturday. Call 948-2444.
In-line skating course: With Tim Temple of Camp Rollerblade, 5:30 to 7:30 p.m. Thursdays, through 23, UH-Manoa's Hemenway Hall. Costs $85 general; includes use of skates and protective gear. Call UH Outdoor Activities at 956-6468 or the Wheel Thing at 487-5283.
Wahiawa Hills hike: 8 a.m. May 19 with Hawaiian Trail and Mountain Club. Costs $2. Call 595-2612.
Argentine tango workshop: Simeon Den and Marie Takazawa, 2 p.m. May 19, Ala Wai Clubhouse. Call 396-3073.
Lyon Arboretum hike: With Ray Baker, 9:30 a.m. to 12:30 p.m. May 25. Costs $9. Call 988-7378.
Schofield Waikane hike: 8 a.m. May 26 with Hawaiian Trail and Mountain Club. Costs $2. Call
Reef walk: Waikiki Aquarium staff talk about reef walking safety, conservation and the natural history of marine life, 7:30 to 10 a.m. June 1. Costs $8 adults, $7 children. Register by mail. Call 923-9741.