I originally set-up my payments to automatically include a 20% tip for Uber drivers. I think they got rid of that feature. One of the Uber draws is that no cash changes hands. You step in and step out. So I don't tip -- I just thank with a smile and the drivers rate me highly. And I them.
I just hope you're bringing enough tiaras to share, BWeaves.
Unfortunately, I would need to check a very large suitcase in order to bring tiaras for everyone, so in total fairness, I'm not bringing any. I'm only bringing one small carry on for 7 days travel.