http://www.aruba.com/forum/search.php?searchid=380873
reading all of the "input" about tipping/and service charges will make you blurry eyed.
that being said, here are a bunch of threads all regarding tipping.
what do dear husband and i do?
if there is a service charge already added on...........we tip an additional 7 or 8% if service is fair or good. if great, it is about 10% more. lousy......0
if no service charge added on we typically tip 20%.