Admire Kuala Lumpur's skyscrapers, including the symbol of the city: the Petronas Twin Towers. Tickets to the Skybridge sell out early; it might be easier to get a ticket up to the observation deck of Menara KL Tower, which stands 1,000 feet tall. The KL Tower is also the official observation point for sighting the moon to determine the start of the holy month of Ramadan.
See some of Kuala Lumpur's older buildings too. The Sri Mahamariamman Temple is covered with Hindu statues, and Jamek Mosque is in the Moorish style (you can tour parts of the inside enter if dressed conservatively). The National Museum is beautiful, too, and has replica Malay houses inside. The intricately decorated six tiers of Thean Hou Temple are a Kuala Lumpur landmark.