I leave $5 a day no matter which resort we are staying at. Its usually 2 or 3 of us (myself, DD11 and DBF or DD19 *school and work*). Whats funny is the only thing they really have to do is change towels, leave soap, coffee *WL*, make beds, and take the garbage which I already bagged up. Everyone teases me that I clean the room more than the mousekeepers (untrue) but I just don't want those poor souls to see how messy my family can be (but hey, we are on vacation). Plus if $5 can brighter their day its worth it.
Once I left a small bottle of Coco Chanel lotion (never used). Our mousekeeper said she liked the scent of the perfume I was wearing and thats what it was. That was when we stayed Poly CL and the mousekeeper comes in twice a day. I thought she deserved it and she left a nice thank you note.