I drove through the gates at Divi in the spring this year. Told them we wanted to have a look at Fort Amsterdam. Had no problem getting in and parking right next to the Hotel.
Walked through the grounds to Fort Amsterdam and took pictures. Had no issue with anyone questioning why we were there and no problem parking. So apparently it's just a matter of who the gatekeeper is on any particular day.
Here are a couple pictures I took walking around Fort Amsterdam. Only there for about a half an hour and then walked back through the resort.
