Hi Gail,
You could take a short detour through the Cameron Highlands en-route. Depends whether you're going by rail or road as to what options you have but since you're on a 3-day limit, I'd recommend taking in the
Highlands,
Melaka, and one of the islands, probably
Penang as you're on a short timescale.
Hope this helps.
Beautiful sights, beautiful food, beautiful people. You'll love it..