Travel to Malaysia (a one-week trip)

We are departing tomorrow for Malaysia for a one-week travel. The trip is expected to take 12 hours from Jeddah to Kuala Lumpur. This is my first time to go to Malaysia.
I heard that it is now the best season to go to Malaysia but also some suggestions came from some friends including some Malaysian ones. What they said is that due to Christmas holiday starting on 23rd of December, it is not very convenient for a trip to Malaysia. People will be very busy for travelling in and out of Malaysia. Anyway in general I have very positive opinions about Malaysia from the friends and some Master students.
I am happy to go there since I will be able to see my dear Malaysian friends there (Dr. Azmi Hassan and Dr. Safian Shariff) whom I have not seen them for many years. Some places to visit there were suggested as Langawi and Penang (I am not sure about the spellings.) Some friends told me that Kuala Lumpur looks exactly like Jeddah. The most famous place to visit is for sure Petronas Towers (or Petrona towers ??) in Kuala Lumpur. We will see -inshaAllah.
Hope to write from there…
BTW, when I searched in internet I saw that there is a common misspelling for Malaysia. Many people have written it as Maleysia instead of Malaysia. And Google did not bother to index them ..:)