On WAVE, we will be using (along with Kathy & Frank and Wendy & David) private guides at three ports - Malaga, Santander, and Bordeaux. What is your experience and good counsel regarding tipping private drivers and guides? Does it make a difference if he owns the agency? (This is like the debate about tipping one's hair-stylist if he or she is the owner of the salon...) We have usually tipped private guides about 10 percent of the cost of the tour but are not at all confident that was appropriate. (The fact that one usually never sees the guide again for the rest on one's life makes it difficult to learn whether the tip was taken well or not - if the tip was too low, they will never have the occasion to spit on you; and if it was too high, they will never have the occasion to suck up to you again!) Thoughts, please.