In the old town can be found a lot of old houses and on the sea side, opposite the mainland, Fort Cornwallis, which isn't very big nor intersting, but one thing the English left there. It's also possible to visit some of the houses in the old town of formerly rich people and see the interior.
Georgetown isn't very big, but in the old town it's possible to find a bit of everything: colonial houses, Chinatown, little India, Chinese temples, Hindu temples, mosques and churches... multicultural!!
So, in a few meters you change from the Chinese quater to the Indian one and in both they have a lot of food, very delicious!
In the northwest of the Penang island is the Nationalpark located. The rainforest is nice and they built a canopy walkway, so you walk on bridges from one tree to the next one, see the trees from a higher level and feel like a monkey. On a sweaty walk we went to the Monkey beach, unfortunately we couldn't see any animals there, but on another opportunity we saw some monkies and also quite big lizard (name unknown) which escaped always into the water when we approached