Whether it 19s diamonds or designer jeans you 19re after, the open-air Malibu Country Mart (3835 Cross Creek Road; www.malibucountrymart.com) is the place to cruise for them. Its more than 50 retail stores and restaurants include Ralph Lauren, Juicy Couture and Malibu Rock Star jewelry. In an adjacent space, the new luxe Malibu Lumber Yard shopping complex, with stores like J. Crew, Alice + Olivia, and Tory Burch, opened in April.