I have only been to Williamsburg once and we did have a car since we drove down from DC.
What I would want to know is, are you planning on spending all of your time in Colonial Williamsburg? Is there a shuttle, or transportation from where you are staying? Will you want to explore any of the surrounding area?
Since I was curious I checked some reviews (tripadvisor) for the resort. I was mostly trying to see if anyone mentioned transportation. A couple of comments you might want to take into consideration:
"Unfortunately, no food or bar is open now, but a shopping center with restaurant and food market is five minutes away.'
"Depending on where you condo is you may need to drive to the pool."
"Somewhat of a drive to colonial williamsburg but pretty close to outlets, highway, et cetra. You need a car here."