The service on the Gold List's top-scoring line is "unparalleled—I haven't experienced this kind of professionalism anywhere else." Ships sail to all corners of the globe, so adventurous guests can zip-line through the New Zealand rain forest or ride a fighter jet in St. Petersburg. The Symphony has "a beautiful promenade deck that goes all the way around, perfect for joggers." Staterooms have verandas, down duvets, and featherbeds; penthouse suites include personal butler service and full whirlpool tubs. Onboard classes cover everything from dancing to digital photography. "The food is too good" and is served in a dining room where "you never have to ask for anything—you just look up and the staff know." In 2008, Crystal introduced cheese sommeliers to educate passengers on the 50 cheeses stocked on each of the vessels.