We visited Langkawi island one time.
It is about 1 hour by airplane from
Nice beaches are there, so we just relaxed there though.
But it looks like the whole island is a geo park, so I think there are many things to do.
Also there is cable car which you can go up to the mountains on.
That time when we were there the wind was strong, so we couldn’t check it out.
But there is a sky bridge there too.