Tipping in Saipan:

There are several establishments in Saipan that keep all tips and put the money back into the company.  The locals say that this is very common and as a result many of them do not tip at all. One waitress explained that this is true in some establishments but not all of them.  Her best advice was to ask your waiter or waitress if they were permitted to keep their tips, then make a decision about how much to leave.  If they get to take their tips home at the end of the day, you can be assured they would appreciate your recognition of a job well done.  

Of course, never overlook the value of a smile and a thank you.