Krakow is ace! I was there for a couple of days last month, planning on going back at some point to finish off the bits i missed. The salt mine is impressive (quite dear though, but can’t remember quite how much). We did a bike tour of the city that was frankly a bit shit, as it got too bogged down with the stop-start. Much better to hire bikes and get yourself a map – hooning along the side of the river in the blazing sun was great (probly a bit nippier now though). There’s a basement jazz club in one of the main squares that’s worth going to, it was a welcome alternative to the myriad pub crawls that set off from the main square; great music, decor and the most wildly extravagant barman i’ve ever seen – even ordering a glass of tapwater got the full cocktail flip/crush/spin/ignite treatment.
It’s not that cheap, but cheap enough (restaurant meal, 4/5 pints and entry to the club was about £25) considering it’s a city centre. no doubt you can do cheaper by exploring a bit.
The radio krakow studios had a gig on in their courtyard while we were passing – weird folky kate bush-y type thing (this is a good thing) that was presumably free, as no-one stopped us wandering in to watch – no idea whether that’s a regular occurrence, but worth checking.