Side trip in Europe?

Hi. It's a long way from Oz to France, so I'd like to go somewhere interesting I've never been before after the Zylberman bash, probably around the weekend of 12-13 July for 3-5 days. Possibilities include Barcelona, Budapest and St Petersburg. Maybe Amsterdam, where I have been, but which is worth a return visit. Maybe somewhere in Poland!? If anyone is interested in joining me in such a side trip, please let me know here in the comments, or contact me separately, and we can discuss. I think it would be nice if a group of us could go travelling, though no doubt the logistics would be difficult to arrange. 

Cheers, 

Rodney