Head to the Waikīkī Aquarium for the 2008 Mauka to Makai Expo, sponsored by the city, Hawai‘i Department of Health and the Waikīkī Aquarium. Watch the moi release next to the Natatorium from 11 to 11:30 a.m. The event will also feature hands-on, educational activities. Free. www.cleanwaterhonolulu.com.