It depends, normally would have post explore beers on occasion. I have nowt against people enjoying a beer while draining mind, but it is better to keep your wits about you, not much fun falling and doing your back or leg in, it can be hard enough staying upright stone cold sober without even having had 1 beer sometimes, let alone being a couple of beers in, on a slippery drain floor. Buildings may present their own dangers. I have a fear of heights, so cannot comment on climbing while having had a few.