A word of caution on using points for a cruise... Unless they have changed things in the last year or so, points are redeemed for a $ value cert. One cert can only be used on one cabin and no credit for any remainder. So if you want two cabins, you must get two certs and the total of each cabin should not exceed the value of the certs. The trick is to attempt to pre-pay as much as you can on the initial booking, tips, gratuities, and even excursions if they will let you.

Good luck on making your choices, but read the fine print before you commit.