However, judging from the landlord's itinerary, I would like to make some suggestions. Hot Air Island and Penang belong to two ends of Malaysia, one in the northwest corner and the other in the northeast corner. The connection between the two places is inconvenient, and it takes a lot of time to get from one place to another, which is not cost-effective. If the landlord wants to go to the first three places, I suggest you modify the route. The island will not go to Rehang Island, but to Langkawi.
The advantage of Langkawi is that it is close to Penang and the route is easy to plan. Moreover, it is a seaside resort that is very similar to Relang Island, but it is another style, beautiful and interesting.
This will make the route easier to plan. After arriving in Kuala Lumpur, first fly to Langkawi, then fly to Penang, then go back to Kuala Lumpur when you are done, then go to Malacca, where you can go back and forth on the same day, and finally rest and sightseeing in Kuala Lumpur ~
Personally, I think this trip is reasonable and I hope it will help the landlord ~