Travel / How much money should I convert for my visit Krakow? (long weekend) [11]

I'm going to Krakow for a long weekend soon. (thursdays until tuesday) How much of my english money would you guys recommend I convert to polish zloty to last me the weekend?

The hotel is paid for already. So i need money for general things like food, drink (I think 2 of my nights will be late ones with a bit of nightlife exploration), and i will get the odd taxi I am sure.

Travel / Popular bar/cafe/club games in Poland? [4]

What bar games are popular in POlish bars, cafes, clubs?
I love playing pool but does that exist in Krakow?
What about billiards? (not that I know the different between billiards and pool)
Darts? Snooker?
Also would you guys say that a high ratio of bars have such facilities? I'm meeting my polish friend and I think this would be a good way to break the ice.