Electric go-cart race: Fourteen local high schools will race go-carts they built at the Electron Marathon, 10 a.m. to 1 p.m. April 12, Hawaii Raceway Track, Campbell Industrial Park. Entertainment by Kapena and the Pearl City High School Bands. Food and drinks available. Call 543-7778.
"Bike-the-Base": Third annual bicycle race, 8:30 a.m. April 12, Kaneohe Marine Corps Base, Dewey Square. Cyclists may choose a 20-mile bike race covering paved roads or a 12-mile mountain bike race consisting of paved and dirt paths. The Bike Shop will provide free bicycle safety inspections from 7 to 8 a.m. All bikes are required to pass a pre-race inspection and bikers must wear bicycle helmets throughout the race. Top finishers in four age groups will receive awards. Pick up race numbers and packets from 8 a.m. to 4 p.m. April 9-10, Athletics Office, Building #1071. Entry fee: $15. A late fee of $5 will be charged for entries received after April 4. Call 254-7591 or 254-7596.
Golden plovers: Phil Bruner from BYU-Hawaii will speak about golden plovers and other shorebirds, 7:30 to 9:30 p.m. April 10 and 7 to 11 a.m. April 12. Fieldtrip to follow on April 12 only. Participants must provide own fieldtrip transportation and a sack lunch. Waikiki Aquarium. Cost: $16. Register by mail. Call 923-9741.
Sierra Club: Maunawili trail hike for people 5 and up (children must be accompanied by an adult), 9:30 a.m. April 12. Meet at the Kailua-bound trail head. Bring water, raingear, bug repellent and snacks. Cost: $3. Call 623-1444.
Stream sensations: Sail a boat, feed a prawn or create an aquatic masterpiece, 9:30 to 11:30 a.m. April 12. Cost: $7. Reservations required. Information at 955-0100.
Nature Conservancy: Guided hikes and volunteer work trips on the Honouliuli Preserve in the Waianae mountains, April 12 and 26. Reservations required. Information at 537-4508.
Lanipo hike: Seven-mile, intermediate hike beginning at the top of Maunalani Heights, 8 a.m. April 13. Sponsored by the Hawaiian Trail and Mountain Club. Cost: $2. Call 235-8330.
Origami: Basic techniques of Japanese paper folding, 7 to 9 p.m. April 22, Japanese Cultural Center, Weinberg Building, Room 102. Cost: $15 plus $5 supply fee. Register by April 16. Call 945-7633.
Hawaiian lei-making workshop: Learn haku, wili, kipu'u and other methods, 9 a.m. to noon April 17, Waimanalo District Park. Bring supplies, including greens, flowers, raffia and clippers. The free workshop is sponsored by the city Department of Parks and Recreation. Call 259-8926.
"Swamp Romp": The marines and sailors of Combat Services Support Group challenge businesses, organizations and other military bases in a five-mile run and obstacle course, 7:30 a.m. April 26, Kaneohe Marine Corps Base. Cost: $72-$90 per team if registering by April 18. Teams registering after April 18 will be charged an additional $15. All competitors will receive a T-shirt. Competitors must wear utility/long trousers or sweat pants and some type of boots. No spandex or tennis/running shoes allowed. Awards will be given. Pick up packets from 8 a.m. to 4 p.m. April 23-25. Entry forms available at 254-7596 or 254-7591.
Tai Chi Chuan: Chinese art reducing anger and stress, and increasing softness and flexibility, 4:30 to 5:30 p.m. Mondays and Thursdays in Kekela Gym, Queen's Medical Center. Cost: $35. Register at 547-4780. For other classes, visit the center's Web site at http://www.queens.org.
Honolulu Marathon Clinic: Weekly jogging program with Dr. Jack Scaff Jr., 7:30 a.m. Sundays, Kapiolani Park Bandstand. James Honke leads a 6:30 a.m. program Sundays, Wahiawa Recreation Center.
Taiko classes: The Taiko Center of the Pacific offers classes through Kapiolani Community College. Call 737-7236.
Hawaii In-Line Skating Association: Workouts 5:30 p.m. weekdays at Kakaako Park. Call 988-5299.
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.
Honolulu Community Drum Circle: Drummers, percussionists and dancers gather, 1 to 5 p.m. Saturdays, Keehi Lagoon Park. Potluck. Call 377-DRUM (377-3786) to confirm location each week.
Hash House Harriers: Social runs with Aloha group 3 p.m. Saturdays; call 948-AHHH (948-2444). Or Honolulu group 5:30 p.m. Tuesdays; call 948-HASH (948-4274).
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.
Night reef walk: Waikiki Aquarium staff talk about ocean creatures and their habitat on a tour of the reef, April. Costs $8 adults, $7 children. Register by mail. Call 923-9741.
Sports Acrobatics Hawaii: Hawaii Highflyers Trampoline Club for adults and kids, 4 and 5 p.m. Mondays and Wednesdays, McCully Recreation Center. Call Karl Vorwerk at 949-3747.
Waikiki Acrobatic Troupe meets 4 p.m. Sundays at the beach across Kapiolani Park Bandstand; free workout at UH Studio Four 8 p.m. Wednesdays. Call Don Heafner at 536-7205.
Ikebana classes: Lillian Koide teaches flower arrangement 9 a.m. to noon Wednesdays at the Japanese Cultural Center. Tuition $30 per month plus supplies. Call 537-5765, evenings.
Honolulu Zoo: Zoo opens at 8 a.m. on the first and third Wednesdays of the month. General admission $6; $2 with Yum Yum Tree senior card. First Wednesdays feature a botanical tour at 8:45 a.m. for $2 more. Third Wednesdays, tai chi practice begins 8 a.m. Call 971-7174.