Whether or not you choose to run the 7 miles home from Center City to Manayunk, you should really do yourself the favor of stopping into Pitchers Pub between the hours of 6pm and 8pm.
I am not joking when I say that this is hands down the best happy hour in Philadelphia in terms of value for money. For $3 a pop, you can get at least 75% of what's on their draft list of 27, and it's a serious draft list. I stumbled into the place with my brother-in-law thinking I'd knock back a Miller High Life, and the next thing I know I'm on my fourth pint of Fat Head's Headhunter. Food was an afterthought, but also cheap and surprisingly delicious.
There's a chance you'll walk by this place and think, "Wow, what a shithole," or maybe, "But I'm not wearing a white hat and boat shoes!"
Keep these thoughts to yourself and just walk in. You'll be as surprised as I was. Buen provecho.