in general: your free rebid zones are zones that you have no interest in staying in but only contain star ratings strictly lower then the one you're requesting i.e., you want the Hilton which is a Resort in the DWV zone, and bid $60 in the DWV zone so currently a free rebid zone for you is Kissimmee because even though you don't want a hotel in Kissimmee, Kissimmee currently only has 2* or lower hotels avaiable through bidding on priceline, (2* is less than Resort) thus the point is you can safely increase your bid to $65 and add the Kissimmee zone if that doesn't work you can increase your bid and add free rebid zones as for safely getting the Hilton..............although people tend to get the Hilton around $60, that doesn't mean you're guaranteed to get the Hilton.........you have to be prepared to accept a different Resort, so don't hedge your bets on the Hilton