If you're doing it just for the points and/or stay credit (and don't need the additional room for guests traveling with you), many people, myself included, have booked "phantom" stays at lower-priced Hyatt properties and used 1-800-CHECK-IN to register.

For example, the Woodfield Hyatt in Schaumburg, Illinois usually has some cheap weekend rates that count for stay credit. You can be thousands of miles away and still do a mattress run here or at any other Hyatt, thanks to phone check-in.