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So when it comes to Auschwitz I suggest to use some operator. You do not need to carry about transport etc. and with the Guide in such a place is always nicer. Same thing about Salt Mine – there are plenty of places in Krakow where you can find all those Tours.
About Car – do they need it to go somewhere else besides Auschwitz / Wieliczka Salt Mine ? If no – in my opinion car is not needed… Most of the things in Krakow is walking distance or there is Uber/Bolt.
Tolls – u have to pay for the road from Krakow to Katowice – but to Auschwitz there is also tools free road. Anyway if they decide to use Tour operator for Aushwitz all will be covered I believe

PLACES TO VISIT in Krakow
-WAWEL Castle
-KAZIMIERZ Jewish district
-Market Square with the Mariacki Church and Sukiennice building.
-Oscar Schindler Museum

FOOD & DRINKS PLACES

FORUM  Pretty cool place with various food/drinks selections – when is nice weather ppl can hang out outside
https://g.page/Forum-Przestrzenie-Krakow?share

STARKA  Traditional Polish Cuisine and solid vodka selections ������
https://goo.gl/maps/BLjsceHBZ3waH5aC6

WESELE  Polish Cuisine
https://g.page/restauracja-wesele?share

MORSKIE OKO  Polish Cusine
https://goo.gl/maps/96xfKQviuyZv6FCf7

HOUSE OF BEER  Beer place
https://goo.gl/maps/arsuFnLKhV7vunmB7

BEER GALLERY Luxury  Little cute Belgian Beer pub just next door to House of Beer
https://g.page/BeerGalleryLuxury?share

HAMSA  Middle Eastern dishes at Jewish district
https://g.page/hamsarestobar?share

PIJALNIA WODKI I PIWA  3 locations or even more in Krakow: Super cheap place to get trashed