Hilton hotels across Oahu launched a new cocktail program this week. In honor of Earth Day, five Hilton properties have concocted craft cocktails for Cocktails for a Cause, a social initiative designed to highlight local ingredients while raising money for Koolau Mountains Watershed Partnership. One dollar from every Cocktails for a Cause drink sold through May 27 will benefit the organization. “We created Cocktails for a Cause as a tasty way for guests to make a positive impact on our local…