Peruse a few of the museums York has to offer, including the Agricultural and Industrial Museum, Colonial Complex, and the Freedom Center and Underground Railroad Museum. If you get hungry, swing by Central Market House on West Philadelphia Street. They have some great home-made food (including local favorite, Roburrito's, and some good, Amish whoopie pies) available in the original market house, built in 1888.
Start off with tons of tasty craft brews on tap at the Holy Hound Taproom (seriously, they have dozens)! There's a great, big arcade across the street, which you can hit before you continue to mosey on to Mudhook Brewing Co., Revival Social Club, The Fig & Barrel, or The White Rose Bar & Grille. All are within walking distance. Park in the Prince St Garage, or in the lot across the street from The White Rose. Be sure to try a Crab Pretzel at Holy Hound or White Rose!
See where chocolate was once made! Now you can ride rollercoasters and enjoy their waterpark. Check out Chocolate World just outside of the park for a history lesson on Hershey!
Say it like a local - Lankister, not Lan-caster. There's shopping outlets, and a happenin' downtown with lots of fun bars and restaurants. Choose your own adventure here! Oh, and be careful, you may run across some Amish Buggies if you take some back roads over to Lancaster. About 45 minutes away from southern York County.
The Three Mile Island accident was a partial meltdown of the Three Mile Island, Unit 2 (TMI-2) reactor. back in '79. They don't do public tours, but you may get a nice souvenir of your own if you get close enough!
Busy harbor area with the Science Center museum & National Aquarium, plus historic warships. They have family-friendly museums and activities, street performers in the warm months, and maybe even some tall ships you can marvel at in the harbor!
A city with a ton of quirky shops (check out Condom Kingdom on South Street), historical sights/sites (Liberty Bell, Independence Hall, the works!), and genuine Philly Cheesesteaks (Jim's on South Street is a popular spot!).