Sierra Club trail building: Help work on the Maunawili Falls access trail, Saturday, Sunday and June 30. Bring backpack, lunch, two liters of water, shoes and rain gear. Call 538-6616.

The Club works to eradicate miconia, a plant that has overrun Tahiti, June 29 and July 20. Bring lunch and canteen; tools and refreshments provided. Call 538-6616.

Sunday on Wheels: Mayor Jeremy Harris and his wife, Ramona, lead a six-mile family ride Sunday along the new Kapahulu Bikeway Extension. Ride begins and ends at Kapiolani Park Bandstand, with music by the North American Bush Band from 10 a.m. to noon. Free. Call 527-5044.

Kahana Valley hike: Marc Morinaga of the Hawaiian Trail and Mountain Club leads the way into a state park with swimming holes, 8 a.m. Sunday. Six miles. Costs $2. Call 235-6543.

Maunawili Trail and Enchanted Lakes: Hike and look for birds with the Hawaii Audubon Society, 8:30 to 11:30 a.m. Sunday. Meet at Pali Lookout. Donation $3. Call Dan Sailer at 455-2311.

Bead show: Antique European glass, sterling silver

and seed beads, 9 a.m. to 5 p.m. Sunday, Ala Moana Hotel's Gardenia Room. Free admission.

Honolulu Zoo: Enter the nightlife of the zoo's citizens, 7 to 9 p.m. June 27 through 30. Admission $7 adults, $5 children. Reserve at 971-7188.

Learn to swim: The American Red Cross has free classes for children on Saturday mornings and adults on Monday, Wednesday and Thursday evenings at Ala Moana Beach. Call 734-2101 ext. 123 or 124.

Tai chi at Honolulu Zoo: Practice of Chinese martial art begins 8 a.m. on the first and third Wednesdays of each month. Costs $6 general, $4 kama'aina, $2 with Yum Yum Tree senior card, $1 children, and free for kids 5 and younger. Call 971-7174.

Hawaii Israeli Recreational Dance: Noon to 3 p.m. Sundays, Ala Wai Ballroom. Costs $3.50. Call 623-3603.