For return trips from any of the parks, the usual route is Peninsular Road, South Point, Old Turtle Pond, Miller's Road and Hospitality House before heading back to the park.
The DD bus will usually stop at Hospitality House (it should have the "Intenal" marquee) and then head off to the other stops - sometimes going to Miller's Road first followed by Peninsular, South Point, Turtle Pond and then a final stop back at Hospitality House before a return to DD.