This spring, Walt Disney World in Orlando, Fla., will launch a program that will allow participating customers to bypass entry turnstiles and use rubber bracelets encoded with credit card data to enter and buy items inside the park. Customers also would be alerted by smartphone when certain rides without lines become available. The bracelets are part of a vacation management system called MyMagic+, which is part of a larger effort to make the park easier for guests to navigate. "If we can enhance the experience, more people will spend more of their leisure time with us," said Disney Parks and Resorts Chairman Thomas O. Staggs. The new technology also will allow Disney to track guest behavior, but observers say Disney is aware of potential privacy concerns.