Was there on a stag weekend a couple of weekend's ago.
Check out this website: http://budapestpissup.com
They arrange activties, pub crawls and take you to the less dodgy strip joints.
Cost about ??6 a person, but seeing we would have been completely ripped off otherwise by all the dodgy strippers, it's worth a go.
I know this sounds like an advert, but had a fantastic time.