i'm headed to the the sheraton dubrovnik the second week of july as part of a 10th anniversary trip with my wife. i am using points for my stay. i know that this is the busy season for the adriatic coast, but is their any point in trying to contact the property and see if i can secure an upgrade in advance? we also have a couple of days at le meridien in split, also. this is our first trip together without the kids in over four years, so we're really looking forward to it.