My nephew and I are going for the first time by ourselves in July and I was wondering the same thing. What is the fair amount to tip? To me $2 per day seems cheap while $5 per day seems like a lot for two guests, especially if by chance you get the same mousekeeper on multiple days.
If we don't use pre-made envelopes where is the best place to leave the tip: nightstand? If there is stationary and pens in the rooms at POP I was planning on putting a quick thank you note on top of it each day.