Ask for the bathroom in the lobby
Bring your extra stuff in a back pack
deodorant, shirt, nicer shoes (no flip flops), skirt or capri's, hair bush
You do not need to look like your are going to a party for Cali Grill
but just look presentable.
Enjoy
Also save your receipt for a great view of the MK fireworks with the music piped in from the top of the CR,
Go up the escalator, PAST the Reception Desk and elevator bank.... Here, you will find two Restrooms that virtually NO one uses. A GREAT place to do "Park cleanup", or even change clothes .