Sierra Club: Native plants slide lecture and sale of seedlings, 6:45 p.m. Friday, Paki Hale. Call 538-6616.
JN Automotive Hydrofest: Free admission to the boat races at Pearl Harbor, Saturday and Sunday. Ferry boat provides free transportation to Ford Island from the Pearl City Peninsula and the Arizona Memorial ferry landing. Call 471-9109.
Windward Community College Ho‘olaule‘a: With the Native Hawaiian Band, Brother Noland and others, 9 a.m. to 4 p.m. Saturday, 45-720 Kea‘ahala Road, Kaneohe. Craft fair, food booths, activities for children. Free admission and parking. Call 235-7433.
Navy open house: See the newest Aegis guided-missile destroyer, the U.S.S. Paul Hamilton, 10 a.m. to 4 p.m. Saturday through Monday at Pier 9 by Aloha Tower. Call 528-5700.
Malaekahana Stream hike: Five miles in Laie with Steve Brown of the Hawaiian Trail & Mountain Club, 8 a.m. Sunday. Costs $2. Call 836-4940.
Kaena Point Natural Area
Reserve: Hike the coastline along the western side of the point with John Cummings, Sunday. Four miles, five hours. Costs $7. Call the Hawai‘i Nature Center at 955-0100.
Taro Patch Party: Hands-on learning about a plant important in Hawaiian culture, 9:30 to 11:30 a.m. Sunday, Hawai‘i Nature Center. Costs $7. Reserve at 955-0100.
In-line skating: The Wheel Thing’s “Get Rolling, Hawaii” course for ages 16 and older is 6 to 8 p.m. Tuesdays, Oct. 15, 22 and 29. Skates and protective gear provided. Costs $65. Call 48-SKATE (487-5283).
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.