I worked in Krakow just before lockdown for a few months. Couple of hints.
Firstly get your wife to download the BOLT app, it's an Uber type app. It allows you to book cabs and they are generally cheaper than airport transfers. You can also use it to rent e-scooters, which are nice to travel around the park that borders the city center. It's good fun and cuts down on walking.
Secondly, for Schindlers factory, if you want to spend time going round, don't do the guided tour. The lady that did ours was a grandaughter of a survivor so she talked with passion and it was great, but she moved very quickly through the exibits. It is a very moving experience listening to the guides talk about Poland under soviet rule.
Book aushwitz early, it can get very busy, do it a couple of weeks before going. I have heard people give quite mixed reviews. I found the experience moving, but some didn't.
I thought the salt mines were just OK and wouldn't do it again.
A short walk from the city center is the Museum of Illusion. It's great to while away an hour or two, and it's cheap.
If your wife or daughter are into it there are a couple of bunny and cat cafes. The cats wander round the cafe but with the rabbits you have to pay a small fee to go into the pen area to pet them. Again these are just on the edge of the old city center.
For food and drink, stay away from the square. There are some english bars that show footie, 442, Bulldog and the premier league pub. If either of your ladies likes vodka, book the vodka bar, they have hundreds of different flavoured vodkas.
For drinks, generally, find some polish bars, they are cheaper and generally friendly. They do tend to be in basements in the city center.
There is a mall just on the edge of the old city center, worth a visit if the ladies like shopping. It's a bit cheaper than here.
The architecture is stunning and largely untouched by the war as the Nazi's just walked in.
Do not fly with Whizz Air.