If the email says "Good for stays most nights ... to 6/12/10" does that mean you have to check out on 6/12/10 or since it says "nights" can you stay the night of the 12th and check out on the 13th?
During free dining, PIN codes are good for the length of the stay. For instance, we just got back on the 6th. My free dining PIN was good until Oct.1. We checked in on the 1st (last day of free dining)and received free dining until the end of our trip. (They had extended free dining by that time, but not under the code I booked under.)