The only "private" part of the Beach House property is the pool area itself.
The property is a public access area for the beach and the parking lot and garage are both available for anyone to use for parking. Disney also built public restrooms and even has a window for the public to use to order from the snack bar. The entrance sign does indicate that Resort members/guests are to use the right side and others the left- but the area is not policed by Disney to that end.
Earlier this month, the doors leading to the Beach House were even taped open- since the locks were apparently not working. Hopefully they will have those repaired by now.
<img src="http://disneydoc.homestead.com/files/BHsign2.jpg">
<img src="http://disneydoc.homestead.com/files/BHsign3.jpg">