One partyer, a 22-year-old fashion design student who identified himself as Cheech, said in an interview that he was high on Molly, a form of Ecstasy, which he had sneaked onto the island hidden under his pants. “I’m going to take enough to be safe and have fun, and that’s it,” he said, clearly having fun. Without the drugs, he said, “I don’t think I would be as into the music.”