When in Philadelphia there are a couple of things that you naturally cannot pass up. Number 1 on your list of must-do, must-see, must-eat would of course be Beiler's Donuts in the Reading Terminal Market. Can anything be more heavenly than the Blueberry Fritter? No, no there isn't, sorry. Here's a little bit of history about the baking process and culture behind the best damn donut in town.
My advice, grab a bike share, hop aboard and pedal your way to RTM. Hit Beiler's first and stroll through the stalls inside. Once you've hit sensory overload, ride away with a stomach full of sugar and find a good cup of coffee near Rittenhouse.