I normally tip $1 to the driver if I'm with a group, and $2 if I'm by myself. Sometimes I change it depending on the city and the cost of living.

I never have the maid clean the room until I leave (normally in the room 3 days or less). I leave $5 (or equivalent currency) and any bottled water I have left over. On holiday I leave about $5 per day...

Note:
I am a captain and not at a regional.