Cluj has many things to do, but it depends what time of the week you go to and of course, what you like to do. If going out is your thing, you'll have lots of choices, especially when university starts (I believe Oct 1).
If you're a fan of beer and good food, go to Ursus Brewery pub in Cluj. Very cool place. The city center (downtown) offers lots of choices of entertainment, eating out, etc. Of course, there are museums that you'll enjoy.
The link below can give you some extra info. You may use google translate for the site... it's still in BETA testing
Superior decisions reduce the need for superior skills.