My birthday is August 10th and our anniversary is August 22nd
. The Mariner and Navigator are identical ships. Both the Eastern and Western itineraries are good. You really can't make a poor decision. It's your first cruise so you really won't be able to compare until your next cruise. You did make the right choice for the cruise line. Our first cruise was on Carnival, second on NCL, and the next 29 on Royal Caribbean. You're going to love cruising!