Princess Cruises - Royal Princess a tip or 2

A few lesson learned tips when travelling on the new Princess ships, Royal and Regal as we experienced her awesome splendour this past New Year's.  For one her Piazza is much bigger than the other larger ships in the Princess fleet, but I was a little surprised that the artist's video made it seem so much longer.  It is definitely wider and the surrounding shops and restaurants make it a great focal point.
The adult retreat pool forward is a nice change to the busy central pool especially when there are many families on board and it truly is an adult sanctuary.  The pool is a fair sized pool and the surrounding loungers are ample.  This non fee area is attached to the famous Princess Sanctuary and the paradise of space for a fee is so worth it.  The tip I share as I came across it the hard way was that on the first day when you arrive if you want to book any of the loungers, cabana's within the sanctuary or outside within the retreat pool area, you should book it on that day for the first day fully on board. The difference with the Sanctuary on other ships is that you book in the morning of on a first come basis, on the Royal, you can book anytime during the day for the next day just come early so that you don't miss out.