I'm gonna be in Europe for business this summer.  When business is done, I'm planning on a little personal travel and maybe a little time for the hobby.  
I've spent time in London and have a feel for that.  But I am planning on spending some time in places that havn't really been to very much.  
My list:  Prague, Italy, Croatia.  Those are all places I'm curious to visit.  Does anyone have any hobby experience or even general traveling tips??  
Other recommendations and tips are very welcome.  Feel free to BC.

Thanks.