Arlington County Department of Parks, Recreation and Community Resources, clean up Four Mile Run stream and Bluemont, Glencarlyn and Barcroft parks, wear work gloves and waterproof boots, 9 a.m.-noon Saturday. 703-525-0168.

American Cancer Society, deliver daffodils to businesses and residences Tuesday. 703-937-1928. Also, volunteers for Ambassadors and Allies Program to tell communities about colorectal cancer prevention. 800-ACS-2345 or www.cancer.org

.

Naomi Project, English- and Spanish-speaking mentors for high-risk pregnant women. Training begins March 20. 703-860-2633 or http://naomiproject.homestead.com.

Taste of Arlington, setup, cleanup, tickets sales, ice runners, public relations and more, event May 18. 703-841-7768, Ext. 240.

Arlington County 4-H, work with children 5-12 in the Childhood Obesity Prevention program. Training begins in April. Weekday availability needed. Also, 4-H leaders. 703-228-6404.

World Heritage, host families for foreign exchange students. 703-435-5313.

-- Sarah Lane

Seeking volunteer opportunities? These groups need volunteer help for a day, a week or on a regular basis. Nonprofit groups in need of volunteers should send notices to Volunteers, The Washington Post, 526 King St., Suite 515, Alexandria, Va. 22314. Notices also may be faxed to 703-518-3001 or e-mailed to alexextra@washpost.com. The list will be published on a space-available basis.