Koloa-Kaipapau hike: Five miles along two ridges in Hauula with Steve Brown of the Hawaiian Trail & Mountain Club, 9 a.m. Saturday. Costs $2. Call 836-4940.
Tree gardening: Hoomaluhia Botanical Garden in Kaneohe offers free classes in choosing, planting and caring for trees, 9:30 to 11:30 a.m. Saturdays, Nov. 2 through Nov. 23. A walk 9:30 a.m. Nov. 30 highlights plants of the season. Reserve at 233-7323.
Drum, Dance and Pray for Peace: Sister celebration to gathering of musicians and dancers at the Washington Monument, 2 to 6 p.m. Saturday, Skygate sculpture near City Hall. Bring drums and other percussion instruments. Potluck meal follows. Call 377-DRUM (377-3786).
Ewa Plains Sink Holes: Hawaii Nature Center offers an adventure with researcher Alan Ziegler, Sunday. Short walk to investigate geology and bird fossils; three hours. Costs $7. Call 955-0100.
Casual Chess Tournament: Honolulu Chess Club welcomes players and spectators with an introduction to tournament chess, noon to 5 p.m. Sunday, Moiliili Community Center, Room 105, 2535 S. King St. Entry fee $5; benefits Chess-in-Schools program. Call Larry at 262-5475.
Free garden tours: See Foster Botanical Garden in Honolulu, Wahiawa Botanical Garden or Hoomaluhia Botanical Garden in Kaneohe, 1 p.m. Sunday. Call Foster at 522-7066, Wahiawa at 621-7321 or Hoomaluhia at 233-7323 for reservations.
Taiko drumming: Classes for children and adults begin Nov. 5 at Kapiolani Community College. Beginning, intermediate and advanced classes cost $69 children, $98 general. Call 734-9211.
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.
Learn to swim: Children practice Saturday mornings at Ala Moana Beach; adults, Monday, Wednesday and Thursday evenings. Free. Call the American Red Cross, 734-2101 ext. 123 or 124.
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.
Philippine folk dancing: 2:30 to 4:30 p.m. Saturdays, Lanakila Gym. Free. Call 455-9963.
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).
Hawaii Israeli Recreational Dance: Noon to 3 p.m. Sundays, Ala Wai Ballroom. Costs $3.50. 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.
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.
International folk dancing: Includes Bulgarian, Greek, Rumanian and Israeli dances, 7 to 9:15 p.m. Sundays, Makiki District Park. Donation. Call 923-0362.
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. Free. Call 922-0793 or 955-2577.
Pali Twirlers square dance: 7:30 to 9:30 p.m. Thursdays, Yacht Club Terrace. Call 254-2333.
Honolulu Zoo: The 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.
Nature Conservancy hikes: Two guided hikes a month to Honouliuli Preserve, home to more than 45 rare native plants and animals. Donation. Call 537-4508.