I went on this holiday last year and it was excellent. The visit to the concentration camps was a bit mind searching but a must to keep reminding people of the past. The salt mine was OK, very big and used by the locals on Sundays. The trip south was nice, we had good weather that day, so the scenery was lovely. Poland is a lovely country, the people are very friendly, I'm sure you will enjoy your trip there.
Geoff R