You're in Warsaw, the city that hosted a bunch of UEFA Euro 2012 games. It would be rude not to do 5-a-side football for your Warsaw stag party. Just turn up and play. We'll find you a ball and hire an indoor pitch for one hour, at a venue with shower facilities. A big plus as you won't have to wander round Warsaw smelling like skunks afterwards! Not exactly attractive to the lovely Polish ladies.
Let's be honest, you'll completely overdo it on the first night of a Warsaw stag party. Nothing kicks a hangover into touch quite like an aggressive, sweaty game of 5-a-side. Work off the beers and Polish vodka, settle scores, and show off your tackling skills - or dribbling skills if you really went for it in the bars and clubs along Mazowiecka.
Get into teams and battle it out. The losers buy the beers afterwards. Seeing as you can get a pint in Poland for as little as £1.50, that's no disaster. Once you've finished your match, hit the showers and then find the nearest pub so you can undo all of the good work you just put in. It's tradition. That's the Saturday of your Warsaw stag party done and dusted!