There are many beautiful Chinese clanhouses in Penang, but for me, if you were to choose only one, it would have to be Khoo Kongsi.
It is the most impressive on approach, set in its own square, and once inside, the ornamentation and artwork are exceptional. The detail in the carvings and wall drawings are impressive and unusual.
Not for nothing is this part of Georgetown a UNESCO world heritage centre 
These gardens are a short taxi ride out of Georgetown or they are at the bottom of Penang Hill if you descend by road. They are free to enter and have many lovely trees and flowers. There is a train (paid) that will carry you round the gardens if the heat is too much for walking; it does get very hot in the afternoons. For me, the highlight of the gardens was the Dusky Leaf Monkeys eating the topiary trees near the entrance. They are beautiful and seem quite at ease around people. They are also less cheeky and noisome then the Macaques up the hill, near the top of the park.
Worth the trip for the Dusky Leaf Monkeys alone.
The funicular railway to the top is a good way to get to the top.
Make sure that you go early in the morning; the queues for the train get long in the summer and the view from the top is more spectacular before cloud cover comes in.
You can walk down (you can walk or cycle up too, but I suspect it is a killer journey!) it is a 5k walk. It is very, very steep and took us almost 2 hours. However, there were many monkeys on the way down and it ends in the Penang Botanical Gardens which are beautiful.
The views from the top though are the best because trees line the road all the way down. So, I think if I were to do it again, I would catch the railway back down and visit the Botanic Gardens separately so that I would be able to give them all the time that they deserve.
The London Lark 