I have never stayed at the Poly (I cannot wait

). I just have a few questions I was hoping someone could answer:
1. How long does it usually take from the airport via Magical Express to get to the Poly? Our plane arrives at 11am on 9/15 and was just wondering how to plan our afternoon. I was lucky enough to get an ADR at LTT at 4:30pm after weeks of trying

! Is it safe to say that we could be at MK by 2:30p - 3p?
2. If our room is not ready where can we put our carry-on bags?
3. Can someone explain to me about the refillable mugs? How much are they and can they be brought into the parks? I have never used them but it sure sounds like a good idea.
4. How late is the volcano pool open at night?
I know I have more questions but I cannot think of them right now. Thanks to all who respond. Wishing all a magical time at WDW!