Some places it's 20%. I know 10% is the government tax, the other 10% I assumed was a hotel added fee (never been quite sure, as I do not see this everywhere, but definitely where we stay). For myself, I just tip as if I were in the states. I know the person helping me is getting it then. I'm only there for a few days, I figure it as part of my travel budget. Maid gets $10-20 a day, luggage guys at airport and wherever a few $$ per bag, drivers tipped even after ride price negotiated. I even tipped the cook who made me all those fantastic dinners at Tensing last year. Sometimes, I think it is going overboard, but I only get to go once a year, so I just put it in that context for myself. I know that tipping at the resort has lead to service above and beyond the norm. I've had special meals made for me, stuff brought from outside by staff (last year, I got to try breadfruit for the first time after a random conversation about seeing it cooked in a video... It was not a menu item, one of the waitstaff brought it from home and asked the cook to make it for my breakfast) one of the bellboys even brought Cindi a goodbye gift a couple years ago (it was decorated shells, but is still out as a tchotchke in the house). The added expense is worth it to make someone else's day a little better for making my one vacation a year more enjoyable.