I completely agree with Dancing Queen.
I have cruised with Princess many times - I just came back from the Grand yesterday.
I am 32 and the crowd is always older, mostly mid 40s and up. But there are always lots of couples and/or honeymooners so you will probably find others to hang with. This past cruise, there were tons of couples in their twenties.
As far as nightlife goes, I adore Princess but I find that there is not much of a party/nightclub/dancing atmosphere in the discos. There always seems to be the same handful of people there every night... At least you'll be a party of three to have fun together! If you like dancing to live/band music like country, classic, etc in the bars like Wheelhouse Bar or Explorers Lounge, you'll be fine (I personally prefer the pop/r&b/disco atmosphere and am a night person).
In any case, in my opinion, you can't really go wrong with Princess. The service is exquisite and the crew are always great and friendly. I will travelling with Carnival in September 2003 for the first time just to see what the difference is but I know that Princess will be hard to beat ..!
And San Juan is a great place - I go there almost every year!
Have fun on your cruise!
