Langkawi,Tioman,Redang or Perhentian islands?

Hi, We are a group of young people and we will fly to Malaysia in August. We will spend 3 nights in Singapore,3 nights in Kuala Lumbur and we also want to spend 6 nights in a paradise island but we cannot decide which one. The problem is that we like to go to touristy places and sightseeing, have things to do and ... show more Hi,
We are a group of young people and we will fly to Malaysia in August. We will spend 3 nights in Singapore,3 nights in Kuala Lumbur and we also want to spend 6 nights in a paradise island but we cannot decide which one. The problem is that we like to go to touristy places and sightseeing, have things to do and enjoy at nights but I have read many reviews for Langkawi that is not actually a paradise island. We like clean and nice white beaches where we can go for snorkelling and also relax for a couple of days. Tioman,Redang and Perhentian islands look much more beautiful at pics but we are worried about our transportation there also being trapped with nothing to do on the islands. We are confused and cannot decide which island offers the best paradise beaches but also have some nightlife and things to do. Can you suggest which island is the best for us or maybe a combination of 2 islands?
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