627 is my favorite cabin on Navigator. Just next door to Doug's favorite, 629, but it is a three person cabin. If you book this cabin, you ensure no kids around (at least kids as third person in cabin).

You can get discounts from TA in addition to 2 for 1 some of the time. As for credits, TA shipboard credits are no longer combinable with Amex Platinum shipboard credits. So, if you have Amex Plat use that; if you don't, there are some TAs that give shipboard credit. Of course, Amex Plat has a lot more benefits, too.

Navigator is a great ship; you will have a wonderful time.