We will have our son (18 month old) with us
Quite a young age to keep entertained, but here are a few things you might consider going to.
There is the Kraków chocolate factory:-
This park sounds particularly good for children :-
Puppet theatre :-
Family focused cafe and ice-cream parlour:-
Water park, although at 18 months he's probably a bit too young :-
Butterfly museum :-
/krakow/Museum-of-Live-Butterflies_129987vKrakow: Nimfa Wisla River Cruise?
Related: Anyone been on this cruise or the booze cruise? Is it a worthwhile activity?
It's a great way to look over this city."Starting from the royal castle, Wawel, the ship can take you as far as Tyniec monastery, making the cruise a real joy for both adults and children. And if you would like to make the the river safari even more thrilling, you can book a cruise at night or accompanied by artistic show and music."
Check the weather though; unlike cold and wet - sunny and warm day is always a good addition.