Whereas Kuala Lumpur is a huge and blitz metropolitan, Georgetown has a down to earth and relax vibe. Situated on the Penang Island it's where you'll find streets and streets full of colonial buildings, old shophouses, little museums and of course good food. Georgetown has a groovy edge, there are a couple of hip coffee bars and fancy new restaurants.
Be sure to visit Khoo Kongsi, an old clan house and the Cheong Fatt Tze Mansion, utterly beautiful architecture and atmosphere.
Go and explore this lovely town on foot and if you're tired of the city, hop on a motorbike to discover Penang island. We ate our first Durian, the king of fruits, on the road (we could not postpone it any longer) and had mixed feelings about it... Saw some Dusky Leaf Monkeys in the Penang Botanical Gardens and enjoyed the cool breeze while driving along the seaside. The beaches are definitely more beautiful elsewhere in Malaysia, so don't get your hopes up about that. 
We ate amazing dim sums in De Tai Tong and lovely Indian dinners in the Indian 24/7 restaurant. You can have an interesting nightly drink with the locals in Lorong Stewart at the night shop, nothing fancy, but a lot of ambiance.