Wishing someone to "have fun" in Poland

I am going to write a card someone who I used to work with...
How would I say something like "Congratulations and have fun!"

Would "Gratulacje i Życzę dobrej zabawy!" sound right?

I'm not a native speaker but that sounds very weird to me, without knowing more context. Please supply more context....

Życzę dobrej zabawy! - is OK but rather formal. Colloquially people would tend to say: Baw się dobrze!

At the same time they're offering congratulations? I dunno....

"Have fun" is much more general and less specific than baw się dobrze which ime is said to people going to a party or going out on the town, usually it's limited to a specific situation and not a kind of general good wish (which it can be in English).

Why not use the same words that everybody use for Birthday, New year,Valentine Anniversary etc. "wszystkiego najlepszego" ??

"Dobrej zabawy!" is by far the phrase I heard most:-) "Bawisz się u........?" = Did you have a good time with...? was also a construction I remember, though I was told it's highly colloquial and only used amongst close friends/family.

Thanks for the replies everyone.
I suppose it should be separate as I wish to Congratulate them on their achievement so far but also for them to enjoy themselves at their new job.

I hope that makes sense. I'm not sure if it will translate well into Polish.

Try anyhow! They'll both respect you for your effort:-)))

Yeah, I thought it might be something like that. I don't think Polish people make an automatic connection between 'job' and 'enjoy' or 'fun'. It makes more sense to wish your friend success (powodzenia) or just 'all the best'

Gratulacje i wszystkiego najlepszego w nowej pracy! (congratulations and all the best in [your] new job!)

The native speakers will probably come up with something better.

I agree, Maf! Good point. Shows ya can't simply say the same stuff in another language; you have to say DIFFERENT stuff:-)

Okay thanks a lot everyone! You're right I know they'll appreciate the effort regardless :-P