Singer Graham Nash (of Crosby, Stills, Nash and Young) remains hospitalized after breaking both legs in a boating accident off Kauai’s south shore. Nash, 57, was boating off the Hawaiian island with his wife, Susan, and up to 15 friends on Sunday when the boat they were in hit a wave, throwing Nash into the air. (The Nashes are part-time residents of Wainiha on the island’s north shore.) “As he was coming down, another wave hit the boat and he landed very hard on the inside of the boat,” said his manager, Gerry Tolman. Nash was taken to Wilcox Memorial Hospital, where he underwent surgery to insert pins in his legs. The singer will require a wheelchair for a couple of months while undergoing physical therapy, said Michael Jensen, his publicist. “He’s lucky he’s alive,” Jensen said.