I'm a thirty-something based in Amsterdam, the Netherlands who is passionate about travelling and writing. I've visited 60+ countries in 6 continents.
Lang Tengah is a lot smaller than Redang. Redang is bigger, even has a small airfield and the better hotels/resorts plus the facilities. This also makes it busier. LT on the other hand is very secluded. Quite a few snorkelling/diving trips from Redang also stop by LT. Both islands are fine for toddlers - at least, I saw several families with young children on both islands and they didn't seem to have a problem. It is possible to charter a boat from Perhentian to LT/Redang but it costs a lot. There are no scheduled boat links. I believe around 800 Ringgit but bargain furiously. It's about a boat 45min ride. Here's an article that might interest you: http://velvetescape.com/blog/2009/05/getting-over-my-jaws-complex/ over 11 years ago
Here are 10 things to do: http://velvetescape.com/blog/2009/10/ten-things-to-do-in-kuala-lumpur/ If you love shopping, check out this article: http://velvetescape.com/blog/2009/10/shop-till-you-drop-in-kl/ about 10 years ago