There's a McDonald's outside of Qaid-e-Azam Airport in Karachi that has awesome Chicken Nuggets.
But other than these nuggets, dont waste your time eating Western foods/restaurants. I went crazy 'cause I was like halal pizza hut!!!! but really i ordered too much, and it didn't taste that great. eat the authentic dishes.
also, i had the tendency to buy insane amounts of souvenirs. I went to the Pakistan Air Force Museum, and bought so many useless things cause i was like HEY, IM PATRIOTIC BUYING THESE KEYCHAINS AND CUPS WITH THE AIRFORCE LOGO!!! but it's dumb.
also, dont talk to any strange men who want to help you with your suitcase.