Ronald Reagan is Coming to Poland Soon!

Day 5,650, 22:02 Published in Poland USA by Ronald Gipper Reagan

Hello Polish friends! Let the Russians know that RGR is coming, and Putin and co. better be on notice....
I will be coming to Poland for work in just over a week, and will be spending four days in Warsaw. I will then be extending and spending another four days in Krakow. I should have some available time, although not sure exactly how much! If you happen to be in/near either place, and would like to meet, then let me know.

I would also appreciate any of your tips and advice. My itinerary is going to be pretty set in Warsaw(although could potentially have a little free time, so feel free to give your input), but could use some advice on the following things....
Should I take a train from the central Warsaw station? And I have to check the times, but I was thinking of doing the slower train down since I won't be in a rush, but the fast train back up. What's the difference in quality? I have a hotel in mind that I think I will book, but could use some input there too.

I definitely want to see all the Old Town stuff, and figure I will spend most of the day at Wawel Castle, but also there's the Cathedral and the ghetto, etc. Let me know what I shouldn't miss! I figure I can walk to all the city stuff I want to do. I will also be doing an Auschwitz and Salt Mine tour, and I am deciding whether I want to do the combined one in the same day, or separately? And trying to figure out what the best tours are to do. Any recommendations on restaurants are appreciated also.