I am at Mirage from Sunday June 30 to Thursday July 4th. All nights are using MyVegas rewards with the first three nights in a resort king and the last night in a one bedroom tower suite. Does anyone know if I will likely be able to upgrade to the tower for all four nights? I don't expect it for free, but if it is available for all four nights, what would I likely have to pay for the upgrade on the first three nights ? Also, is this a good time to bust out the 20 dollar trick? I've never done it before in all the many times I've been to Vegas, but I am willing to if it might be effective. Any thoughts and advise are appreciated. Thanks.