Except for 1 of the "free" tour guides, we could have gone absolutely the entire trip without any cash whatsoeve. He may have taken some app, I didn't ask.
The outside of Wawel castle is beatiful and it's great to walk around the grounds, but we were pretty underwhelmed by the audio guide tour of the 1st and 2nd floors. It's basically an ok art museum.
One thing about the museums that surprised us is that all of the audio guide tours are gps guided so the guide knows where you are and when you enter a new room. What a great step up from any audio guide experience we've had before. It looks like the equipment/technology is by a Polish company (Movitech). I'm really not sure why this isn't in every museum all over the world.
There are a couple of great spots to sit outside in Kazimierz for eating and drinking. Just areas with some chairs and fixed location food trucks. If you put in Trdelnik - Coffe & Freshly Baked Pastries you'll get to one. That one had a hot dog truck and Zapiekanka truck that put out amazing food as well.
We did sway from Polish food here and there and absolutely loved our meal at NOAH Israeli Food.
Auschwitz was really moving. Great guide there, very glad we got to make it there. Train back was delayed and delay time was going up so hopped in an uber which was a long drive, train wound up getting there around the same time, but it wasn't worth the risk of potenially losing 2 more hours sitting at the train stration. Wound up eating like $50 train tickets.
Wieliczka Salt Mines was fun tour.
Best Pierogies we had in Krakow was at Mr. Vincent.
Weather was about what we expected, overall probably an 8 or 9. It was about 34C high first day or 2 in Krakow, by the time we got to Gdansk, the high was closer to 20C. In the middle in bounced between and we had another day that was around 28C in the middle. Couple of days where we were dogding rain and got dripped on a bit. The whole first half of the day we went to Malbork was a total rainout, but it was probably the best place we could have been in the rain, wasn't a big deal. We defininitely needed the hotel AC in Krakow and Wroclaw. We didn't have or need AC in Gdansk.
Happy to answer any questions you or anyone else might have.