Here's additional info on the shuttle from the Mariott help desk:
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The Renaissance Waverly is approximately 22 miles from the Hartsfield
International Airport. The hotel provides the following information
regarding airport transportation options:
A&M: $20.00 PER PERSON ONE WAY/$35.00 PER PERSON ROUNDTRIP. GUESTS ARE
REQUESTED TO CONTACT A&M TO RESERVE A SEAT AT: 770-955-4565.
SHUTTLE OPERATES DAILY BETWEEN 7:00 AM-11:00 PM // TAXI: APPROXIMATELY
$40.00
Please be aware that you may independently arrange this transportation.
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Laredo, I'll be watching for you at the shuttle dock, maybe we can storm the place early.

I'm a fairly big guy - 6-4, about 225 lbs. I have a beard & short hair, wear jeans and cotton shirts. No logos. This trip is my 50th birthday present. Hope to see you and anyone else early!
Man this is gonna be a long two months...
Dave