Being Platinum, I am sure you can get a later checkout than 4PM. I did. They were very accommodating and it all depends on whether they have empty rooms available. If you can't get the later checkout they do have hospitality rooms where you can shower and change before departure. We had this great lady at the SPG area of the desk and when we agreed to pay for a later checkout (which they do offer) she gave us a very late checkout for free. Be very sociable and very appreciative...in other words...KISS UP!!!