I'll be visiting several farms the week before BC. What is the 'standard' tipping rate for the tour guide? How does that work- if you are going to see three horses at say Adena, does a groom bring them out and then you tip each groom.

I've only visited farms in California, and neither of my tour guides there would take any tip. Both of the farms in California went WAY above and beyond anything I was expecting, and my visits were wonderful. But I'm thinking California farms don't get much in terms of fan visitors, so they were excited to show someone around who knew and loved their horses.