I was dining at the bar of my wife's and my favorite restaurant. There was another couple sitting just down from us. It was obvious they were visiting from out of the area, so I struck up a conversation with them. I asked them where they were from, if they were enjoying their visit... I then...
It's like tipping the valet when you leave your car with him, or tipping the maitre d' when you are seated. Although it probably does result in extra attention, it should be unnecessary in a well-run inn and most probably makes no difference in that type of establishment.
I would respond by saying how bad you feel that their meal didn't meet their expectations. Let them know that the inn makes a point of securing fresh, locally-sourced ingredients and in fact, the fish you prepared for them was purchased fresh that morning. I wOuld mention that if they had...
As one of the inns on the list (Brewery Gulch Inn), we don't know where it came from either. We were called by another inn nearby to congratulate us and we had no idea what they were referring to.