Starters: The guy at the front desk couldn't be any awesomer.
The light rail is one block away. The shuttle can take you there if you want. There is no fence between here and there. It is apparently an easy walk.
All you need to do is make the reservation with your points or certs. Put a note on the reservation about the car, but they will take care of everything when you check-in. His demeanor leads me to believe it isn't a big deal and it's done all the time.
I've learned something new. I had no idea you could do Stay, Park and Fly with points or certs!