Hi, have just booked a trip with BFF for may. We are staying at the Oasis Grand. Am a little nervous as the reviews are so mixed. If I read two reviews from the exact same week one may be great and one not so great. Maybe I should stop reading ! So the "black wristbands".....what difference do they make? Are they worth the additional costs or no? Any other advice/info welcome. Such as great trips, things to do, not do. Thanks ! Sherri