Day 1: explore KL. Visit Petronas tower, Aquarium, KL tower, National Mosque and evening you can spend in Bukit Bintang or Changkat. Day 2: Take a bus to Genting Highland. Enjoy Cable car, shopping, casino etc Day 3: Visit Batu caves come back to KL and have dinner in Marini's On 57.. lil expensive but worth. reservation is required or For Day 2-3 you can choose to visit Langkawi which is an archipelago with numerous clean beaches. but if your next plan is Indonesia then you can skip it.