The Ramsey's were planning a trip to Michigan, to meet up with John's other children for a second Christmas.
Prahasauarus: I posted before I thought the Ramsey's thought timing was of the essence. The sooner they call the police and get the charade over, the sooner their nightmare is over. A whole day is a huge, long thing to stage as opposed to several hours. Perhaps John was hoping LE would find the body, or maybe he had planned to all along. I don't think either Patsy or John wanted to completely dispose of her body. IMO, I don't think the events played out exactly how the Ramsey's intended it to. I don't know, but to me, it makes perfect sense why they'd call 911 if they were involved.