qqmaro

Yes, most importantly is let the driver know that you are paying credit card before he START the METER, coz as I remember, they need to program ( punch a different button) the meter differently for Credit Card. so let them know ASAP.

For tips, may be 10% , and may be $1 for bags?

Oh, one more thing, I would also suggest you ask the driver the about traffic situation ( how much time it would take) on the day and time when you need to get back to the airport. They usually have a more accurate time, so you can manage your time better.