Sierra Club: Help eradicate miconia, a plant that has overrun Tahiti, Saturday. Bring lunch and canteen; tools and refreshments provided. Call 538-6616.
Trail building at Maunawili Falls on Sunday and July 27 and 28. Bring backpack, lunch, two liters of water, shoes and rain gear. Call 538-6616.
Hau'ula Uka hike: Six miles on a loop trail with Zon Owen of the Hawaiian Trail & Mountain Club, 9 a.m. Saturday. Costs $2. Call 597-8493.
Mayor's Sunday on Wheels: Free family ride on the new Pearl Harbor Bike Extension begins 9 a.m. Sunday at Blaisdell Park. About six miles. Call 527-5666 for updated information.
Chevy & Corvette Show: 9 a.m. to 1:30 p.m. Sunday, Kapiolani Park. Donations accepted for a children's playground at Blaisdell Park (Imua Na Keiki). Call 671-5330. Sponsored by Hawaii Corvette Association.
Hawaii Toy Expo: 9 a.m. to 3 p.m. Sunday, McKinley High School cafeteria. Admission $2, free for kids under 6.
Line dance lessons: Free lessons for beginners at a family
dance, 7 to 8:30 p.m. Tuesdays through Aug. 27, Ka Elepulu Elementary School, Kailua. Call 266-7815 or 235-7747.
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.