The city of Lancaster is at the heart of Amish country so that would be a good central location. Your best bet is to rent a car. There is public transportation but it is very limited and there are taxi services available. You probably want to explore the small towns outside of Lancaster such as Strasburg, Paradise, Bird-in-Hand, and Intercourse (I am not making these up!) to get the "real" Amish feel.
Be sure to stop in a "Family-style" restaurant where you sit at long tables with all the other customers and pass large bowls of food like it was Thanksgiving dinner.
Also make sure to look at authentic Amish quilts. Don't settle for imitations.
Dan (RVM67), Yvonne & 2 nutty mutts
2015 Flagstaff V-Lite 30WFKSS; 2012 Sierra 2500HD Crew
Home is behind, the world ahead, and there are many paths to tread...