a couple of notes. The Courtyard Riverview does have a shuttle servie. It is shared with the Marriott and $5. Because the shuttle originates from the Marriott a couple of times it has been full when it swings by the Courtyard.
Both the Springhill and RI across the river have free shuttle service (shared). One nice note is the RI has a pet policy and plenty of room around the property to walk a dog.