Brewery tours are interesting, but as a fairly well read home brewer and having done a good few tours i now find that the tours are low on technical but in all honesty they are not aimed at educated home brewers with a serious quest for knowledge.

The key i have found is to just engage brewers and if possible take my beer along and when they realise you are basically a professional brewer in a garage they are more than happy to talk in depth about all parts of their brewing process.