Chanced upon this blog and this mommy's description of her trip to Tioman with her kids. She has great tips on where to go, what to do and what to be careful of. She advised that everyone should be careful of sandflies, to pack light and to pack essentials like sunscreen, lots of water and she even brought along some detergent for her kids' dirty clothes. http://makingmum.blogspot.se/2015/08/wander-tioman-with-kids.html
Mosquitos repellent, sunscreen, medicine like panadol , hat do remember the important stuff.