Checking in on my birthday and hoping for an upgrade. We've already reserved a strip view comp room. Does the kiosk show you location of rooms before you're locked into one? Should I just approach the counter and try the $20 tip? Should I check in early in the afternoon or wait until later? Last time we checked in late at night we were upgraded to a huge suite because they were out of regular rooms. We had to move to a regular room the next day.