I wasn’t sure what to expect - this was a great investment.
The info doesn’t break it down very well - Colonial Williamsburg is a “living museum”. The pass is absolutely necessary if you want to enjoy the full experience. Three days is definitely enough for a leisurely exploration. It gets you access to the shuttle bus, and entry into 95% of the homes/shops - without these passes you can’t even get in.
At the Palace, the Wyatt House, the Everard House, the Coffee House and the Capital Bldg, you get guided tours. In all the other shops there are trained artisans there working their crafts and giving lectures on everything from brick making to wig making to looming and the apothecary. These volunteers are extremely knowledgeable, and friendly. They encourage audience participation when appropriate, and really make the experience one to remember.
My kids loved it. They studied the Revolution the year before we went and this was a great way to bring that history to life for them.