Good idea, I know a few lads who've did exactly that to Germany, and didn't even have tickets....Only advice I'd give is to base yourself in a main buzzing city and travel to and from there. You'll get enough "travel" just going to the games, but it's best to position yourself somewhere buzzing for the intervening days...I'm stuck in a Casino most of the time here, which has it's benefits, and is hotter than most other places...but I wished Id stayed in Cape Town or Joburg, as it's much more buzzy, and you have the continuous traffic of different fans tooing and frooing every day...in fact some of the best banter I've had is at airports, where everyone just mingles and chats bollocks. I can't speak highly enough of Cape Town actually, I found it brilliant....some nice ladies there too!