We tipped Becky somewhere between 5 and 10$. (Neither DH or I remember exactly). We had a great ride with Becky and Ike celebrating my birthday in 2004. I know DH loves me because it was during the Superbowl! At first Becky didn't want to accept the tip, but we insisted. We drank champagne during the ride, all over POR and almost into POFQ (then closed for renovations). I highly recommend this experience.