$270 sounds good for concierge. It will be so convenient to go down the hall to get breakfast, snacks, etc.
The WL is beautiful!! You are probably driving down, so I would valet the car and use it for the parks other than MK. For the boat to MK you can just roll the stroller onto the boat.
Definitely bring a pack and play for your room. I think they do have them at WL, but I would bring sheets for it.