JeanH:

Tax and hotel service fees are already included in the total of your hotel bill... so that is what they mean by the 10-15%. Whatever they charge at your hotel already includes it.
However, I disagree with Toad..."Screw that." After a few days in San Pedro, you should be pleasantly surprised by the wonderful people and culture. I truely appreciate all that these people did for me, from simply helping me w/ carrying bags from one place to the next to racing me out on a boat when I missed a day trip by 30 minutes, etc... they deserve to be tipped so leave a dollar or two each day for your maid, mine were very kind to me and I stayed at 3 diff places.
KE