ON THE VALLEY ISLE: Maui Ocean Center offers a 50 percent discount to kama'aina and military through May 31. The center's Sea Talk series continues with Gary Greenberg and his book, "A Grain of Sand: Nature's Secret Wonder," a collection of more than 200 color photographs of individual grains of sand from around the world taken using micro-photographic techniques. The pictures reveal differences in color, texture, size and shape and the presentation discusses the history of sand and the photographic process developed by Greenberg. Each grain of sand has a story to tell covering millions of years of geological and biological history. 6 p.m. Tuesday in the Open Ocean exhibit. 808-270-7075.

The center celebrates World Ocean Day with a "Think Globally, Eat Locally" dinner on June 6, featuring a buffet of sustainable seafood and Maui-grown products. Live entertainment is by Na Hoku Hanohano Award winner Nathan Aweau. OceanFest weekend is planned for June 7-8.

Admission: $12 for Hawai'i residents and military with ID; $6 ages 3-12, $10.50 for ages 65 and older. The Seascape Ma'alaea restaurant is offering 50 percent off a second entree of equal or lesser value to all guests, not combinable with other offers or discounts. Kama'aina and military will also receive an additional 10 percent discount at the Maui Ocean Center Store when presenting a promotional card received at the Front Gate with paid admission. 808-270-7089, www.mauioceancenter.com.

Castle Resorts & Hotels offers up to 55 percent savings for accommodations through June 25.

Hokele Suites Waikiki: Studio, one- and two-bedroom options. Rates start at $173 per night for a two-bedroom suite with full kitchen (four-night minimum ).

Ocean Resort Hotel Waikiki: Studio rates starting at $100 per night for diamondhead view with kitchenette (four night minimum).

Maile Sky Court: Oceanview room rates start at $106 per night (three night minimum through June 30).

Waikiki Shore: One-bedroom garden-view suite rates start at $223 (five-night minimum).