New York City is brimming with girly things to do. Start with a shopping spree on Fifth Avenue, home to high-end stores and boutiques. Treat yourself to afternoon tea at The Plaza Hotel for a touch of elegance. Enjoy a beauty treatment at one of the city's top spas like Bliss Spa or Aire Ancient Baths. Take a scenic stroll through Central Park or visit the flower-filled oasis at the New York...