A couple more things to do.
1. Historical Philadelphia. It's easily walkable and parking is not out of hand. The new-this-past-April 19th Museum of The American Revolution (a couple blocks east of Independence Hall) is worth the time and price of admission. The artifacts they've displayed are pretty mind-blowing. Like this portrait of GW (on loan from the Brooklyn Museum)
https://www.brooklynmuseum.org/opencollection/objects/450 and, right below it behind the same glass, the blue sash he wore in the painting. And the piece de resistance, GW's personal command tent which he used for most of the war. I went there in early June and spent a couple hours; not too crowded.
2. Reading Terminal Market in downtown Philly: good sit-down food in a farmer's market setting.
3. Double-plus on Dixon's muzzleloader thing. IIRC, the big gunmaker's weekend is this coming weekend (28-30 July).
4. I fished the Little Lehigh a lot when I lived down that way. It's not what it used to be, but it's still very good. There is a fly shop in a springhouse on the banks who will sell you local favorite flies.
https://www.facebook.com/daves.heritageflyshop If you're feeling ambitious, you can pop a couple terrain compartments north from the Little Lehigh and check out Cedar Creek, which runs through the municipal rose garden. A little late in the season for the roses, but still nice....
5. The historic part of Bethlehem is another very walkable area. Check out the Sun Inn (Washington, both Adamses and about half the other signers of the Declaration slept there, Lafayette recuperated there after being wounded) and especially the Moravian Bookstore
http://shop.moravianbookshop.com/index.htm (across from the Hotel Bethlehem), the oldest continually-operating bookstore in the world.
6. Pennsylvania Longrifle museum in Jacobsburg State Park, a couple miles north of Nazareth, about 2 minutes from the of-ramp from PA 33.
http://www.jacobsburghistory.com/society-collections/pennsylvania-longrifle-museum/ Limited Hours - one weekend a month, basically. Located on the grounds of the old Henry Rifle factory.
7. Martin Guitar factory tour - Nazareth.
https://www.martinguitar.com/about/visit-us/
