@Ali: Not many things you can do but here are some that came to my mind:
1. Go to hiking all the way up to Pir Sohawa.
2. Go to "Kim Mun" in Jinnah Super. Because you'll definitely miss their amazing food if you're a fan of Chinese food.
3. Crash a wedding in one of the tents you see throughout the city (I have never crashed a wedding waisey).
4. Rahat's Pizza (try the Hawaiian flavor if you haven't already).
and lastly
5. Give me a treat for your birthday
When are you leaving BTW? Would have liked to meet up again.