Owen, my friend said the best options in the Lehigh Valley for a quick visit, should you decide to head that direction, are Saucon Creek, Monocacy Creek, and the Bushkill in Easton. He said not to bother with Little Lehigh despite its ease of access and historical appeal - the stream has sadly declined. The internet will tell you the Saucon has declined also but my friend says that isn't the case at all, it is just a typical brown trout stream where some days the fish are rising everywhere and other days you will swear they are gone.
Good luck wherever you end up!