I would do that cruise again in a minute! I did not have time on either end though and the time changes really took their toll on me! I think going on the Dawn is a good thing as the layout of the ship is better than the Crown or Regal for being in Tahiti/Hawaii.
Take Doug's advice if you can go early, I didn't and I regretted it. I also though the stop at Christmas Island was really neat. The people were so genuine and it was just a nice, interesting place. I enjoyed it and actually did not like that Princess kind of down played it. Bora Bora and Moorea were absolutely super! I took jeep rides there and that was really great, unbelievable views. If I had it to do again, I would jeep and also go to a beach and snorkel! Enjoy! Sue