Welcome to the area (for your short stay) 
Echoing spacytracy’s suggestions - there is a decent amount to do in Lancaster for tourists and be respectful of the Amish and the Mennonites. Mennonites don’t have the strict rules regarding photography but it does come off as rude; some sects of Amish have strict rules regarding appearing in photographs, however, so it’s generally best to stick with just taking pictures of the buggies and horses.
Kitchen Kettle Village is adorable and has loads of fun shops - they have a canning/jams/baked goods shop that is wonderful and has tons of free samples!
Shady Maple is the traditional smorgasbord around here but I highly recommend Millers also; they’re tucked into a little shopping area as well, so you can browse and wander if there’s a wait.
Of course, the Tanger Outlets offer good shopping if you’re looking for decent retail deals also!