hey! well if the cruise is in 1 week then you can lose up to 2 lbs in one week if you work really hard! dont starve yourself and just try to excerise as much as you can instead of sitting in front of the tv or somputer all day long. remember when your trying to lose weight you need to eat healthy and also if you lose more than 2 lbs in one week than thats not healthy!! good luck!!