I would absolutely not be worried about it. As forecast, it's a pretty mild tropical storm which is supposed to make landfall hundreds of miles away from Marco Island. The reality is that your weather will likely be even nicer than it was going to be as the storm will absorb any of the moisture there ordinarily would be on the west coast. Even if it does pass overhead, a dozen hours or so of rain and moderate wind and it'll be over.

Now, if it becomes more serious and shifts course, Marriott will likely let you cancel it.