CELERITAS GUN CLUB (shooting range) We paid around 50 quid, and got to shoot lots of live rounds with a pump action shotgun, ak47, 44 and 357 magnums, glock, amongst a lot of other type of guns. It was amazing, and surreal, especially with a scatty hangover. It's in an old Soviet era bunker, very strange. The magnum 44 and shotgun were crazy to fire, unbelievable power. It's just outside Budapest, easy to get to by train. Best 50 quid you could spend.
Also, the Szecheny (sp?) thermal baths are good for hangovers.
Statues Park too