The installations of two monumental pieces from Chinese artist and activist Ai Weiwei started this week in Austin.

The first — "Iron Tree Trunk" — draws on Chinese cultural traditions and on images the artist collected in the mountains. The 18-foot-high metal sculpture was lowered into place in the Marcus Sculpture Park at Laguna Gloria on Monday.

"Forever Bicycles," a grouping of 1,200 bicycles previously seen in different configurations with different names in New York, Washington, Venice, London and elsewhere, will stand at the mouth of Waller Creek at Lady Bird Lake. Installation will be completed in time for a special public celebration June 3.

The loans of the two works — no end dates have been announced — were arranged by the Contemporary Austin and the Waller Creek Conservancy with help from a $1.1 million grant from the Edward and Betty Marcus Foundation.

Family-friendly activities are scheduled for the Waller Creek site from 10 a.m. to noon June 3 at Waller Delta, adjacent to the Boathouse, 74 Trinity St. Admission is free for this event as well as to Laguna Gloria, 3809 West 35th St., that day. Find out more at thecontemporaryaustin.org/events.

A LONG WEEKEND OF FUN

Opening of Woodland Faerie Trail at Zilker Botanical Garden. Starting Memorial Day weekend, the fifth annual Woodland Faerie Trail features faerie homes and gardens created by Austin gardeners, architects, artisans, businesses, clubs, families, school groups and others. The trail will last through July 30. 9 a.m. to 6 p.m. May 27. $1-$3. 2220 Barton Springs Road. 512-477-8672, zilkergarden.org.

"Close Assault 1944" at the Texas Military Forces Museum. Remember the true meaning of Memorial Day with this stirring look back at World War II. "Close Assault 1944" honors the service and sacrifice of America’s veterans by focusing on the history of the 36th Infantry Division of the Texas Army National Guard during the war. The free program, now in its eighth year, features members of the Texas Military Forces Living History Detachment exhibiting the uniform and equipment worn by the American GI in the European Theater of World War II and that of his opponent. 11 a.m. and 2 p.m. May 27 and May 28. Free. 2200 W. 35th St. Bldg. 6. texasmilitarymuseum.org/tmfmevents.

Memorial Day Splash & Bash at Zip Lost Pines.Get your zipline on for a discounted holiday rate and enjoy food, face painting, vendors, water slides, arts and crafts and more. 11 a.m.-5 p.m. May 29. 1760 Texas 71 W., Cedar Creek.

Find more things to do during the holiday weekend and all summer long at austin360.com/thingstodo.