Went to Munich on a stag a few years ago for Frulinghersfest (spelling) it was like a mini octoberfest and it was excellent. I’ve been wanting to go back there ever since! Good beer, hangovers aren’t too bad and it’s got loads to do. Word of caution though, plan out the nights you are going to the clubbing area. We went on I think a Sunday night and all the clubs were closed but I imagine it would have been mental, from what I remember it was like an industrial estate but every premises was a nightclub.