If your staying in Kempton, than within 15 minutes you have
1. Dixon's (obviously)
2. Hawk Mountain Sanctuary - A Eagle/Osprey Sanctuary with observatory and lookout
3. Kempton railroad - Historic Stream Engin railroad
4. Crystal Cave - Very nice attraction for the cave enthusiast
5. Cabela's - An event itself if you've never been to one. Hundreds of animals including the top trophy kills in PA for dear and bear. African display, arctic display, PA mountain display, etc., etc. What a place. I enjoy Dixon's though because it is more specific to my activities. I can't go to one without the other though because my kids will kill me. They love Cabela's. There is alot more if you are willing to travel up to an hour.
You can go into Lancaster County which you can spend a week there alone. Allentown also has stuff to do. Dorney Park is there, the crayola factory is there. They give tours and samples. If you play guitar you are not far from the Martin factory which is cool. We can talk off post when the vacation gets nearer and I can get you setup better if you like.