Sunset on the Beach is back, and in honor of Earth Month, the movies have a green theme — on the big screen are the climate-conscious animated film "Happy Feet" today and Al Gore's powerful Oscar-winning documentary "An Inconvenient Truth" tomorrow. So head to Queen's Beach for some eco-education. The food booths open at 4 p.m., live entertainment by Pohaku starts at 5, and the movie begins not long after sunset, at about 7:30.