Getting the KLIA Express is the easiest way of getting to KL from the Airport. While your there, try out the various restaurants in Jalan Alor, Go shopping in Chinatown (Petaling Street), just for the experience. Visit both the Petronas Towers and KL Tower for breathtaking views of the city. There is great shopping to be had at Pavillion, KLCC, BB Plaza and Sungei Wang. For nightlife try out Bukit Bintang, there is bound to be something there to float your boat!