I hope you don't mind me adding a few tipping tips!
Housekeeping will only take a tip if it is left on the bed pillows, any other money left lying around the room they are not allowed to touch and they will not take it, even with a note. (This happened to me in WDW during my '99 trip and when I inquired as to why this is what I was told, I also found this to be true in Vegas)
I completely agree with Dana and $1 per bag is mandatory any time someone moves one of your bags.
When people Bring things to the room:
Room Service - At least $2 (same rules apply as when you have a pizza delivered home) if they set it up for you then a minimum of $5.
When someone brings you an out of the ordinary request from housekeeping you must tip based off the request.
In the case of the soap or items that "should" be in the room, I will give $1 to the person bringing something that should have been there, odds are they were not the person who "forgot" to leave the soap etc.
I hope this answers some more questions.
Thanks Dana for starting this thread!
Lisa

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I have a little Mickey in me! :)
1996 - All Star Music Resort
1999 - Port Orleans French Quarter
2008 - Wilderness Lodge
2010 - Polynesian!!!!!!!!!!
Theres a great big beautiful tomorrow, shining at the end of every day.....just a dream away.