I live about an hour from Lancaster and we go camping there frequently and never get tired of it. I know you will have a great time in Lancaster no mater which of the wonderful suggestions you decide to do.
Wouldn't it be great if all of us close enough, could meet up for lunch and spend some time together and with our friend from across the big pond? The biggest problem would deciding where to go, as everybody has thier favorites they want to show off. But I think we could work that out.
Your probably overwhelmed with suggestions by now, but I'll add mine anyway. A nice place for lunch that we like more than the buffet at Shady Maple is Dienners in Ronks.