I'm on this cruise as a bit of a taster for Princess too. It is correct that it can be difficult to get a true feeling for a line from a short cruise, but I'm hoping to see how the food, service and style of entertainment/activities compares. There is a 'group' for the cruise on the other site which you could check out to get an idea of passengers and their expectations. From what I can tell I wouldn't say it seems like it is going to be a 'booze cruise', or not in the traditional sense anyway. More so there seem to be couples similarly trying Princess for the first time, others using it as an easy way to check out the tulips and a few families/grandparents taking their children. I guess if there are any 'stag and hen' party types they might not hang out in internet forums however 😂