Welcome Loulani - sounds like a wonderful way to celebrate your anniversary. We love the Mariner and I can't think of any reason why you won't as well. I think the above posts are a good idea, either put money into a savings account that you can then use to pay off the credit card, or even better call in a shipboard credit for yourself. As Ngaire said, be sure to have your TA inform the ship that its your anniversary and special order a dinner, maybe ask for a quiet table to 2 that night, order some champagne or special wine and really celebrate. Congratulations by the way on your upcoming 35th - that is definitely a milestone. We have actually made it to 38, so we are only a slight bit ahead of you, unfortunately ours is the week before Christmas so we never get to plan a cruise around it. Oh well!!
