The Hanauma Bay Nature Preserve will open its doors from 6 to 9 p.m. July 28 to teach residents about protecting its unique coral reef ecosystem.

The program will feature posters and activities geared toward all ages and will include crafts and interactive activities for children.

The evening event is co-sponsored by the Hawaiian Islands Humpback Whale National Marine Sanctuary, the city Department of Parks and Recreation and the Hanauma Bay Education Program.

For more information, call the bay's education department at 397-5840.