You can walk up the street about 10 or 15 minutes to do some shopping and dining at the mall area- the street is closed off. Beyond that for a day, you probably need a car to go anywhere.
When I stayed there in Jan., a new cinema complex was going up across the street, it may be complete when you're there?
As a gold I didn't get a room comp, but had access to the lounge (limited service during the holidays), and, with the lounge being consequently closed in the AM, enjoyed a complimentary breakfast buffet in the hotel bistro.
A taxi had a hard time finding a Marriott? Shame on him!