Boaters along the coast of Hawaii’s Big Island hit the star-sighting jackpot on August 21, when Leonardo DiCaprio, Lucas Haas, Tobey Maguire, David Arquette, Courteney Cox, Sacha Baron Cohen and Isla Fisher all sailed by on the same yacht. “They went so the kids could be together,” says an insider. “They’re all really close friends and once a year a big group of them go to Hawaii.” The celebrity cruise returned home to Los Angeles at the end of the weekend. “They all had a blast,” reports the insider.