In an article titled, "Does Checking In Mean You Check Your Privacy at the Door?" on HowStuffWorks, Greg Duff points out that the amount of privacy that hotel and motel guests can expect largely depends on the guest's location on the property. "In public spaces, little to none. In hotel rooms, a considerable amount," he said.
Greg also noted that hotels generally will not provide guest ledger details to anyone, unless in grave circumstances such as a threat of harm to hotel guests or employees, or the issuance of a search warrant by a law enforcement officer.
Read the full article on the HowStuffWorks website.