Good Day mate, ( spoken in my best faux Aussie accent ) lol, glad to have you sailin with us, Aussies are even more fun than Canadians, less inhibited...and almost as crazy as we Americans...lol As for crowd problems, just the usual lines at peak times, not bad if you have a little patience, best advice, if there is a show or other activity you really want to see or do, get there a little early, reserve shore excursions as soon as possible, book dinner club online or early in the cruise. If this is your first cruise, you should check out the shows in the main show lounge and the late night comedy shows are usually great. Ships this size handle the crowd pretty seemlessly. There might be a bit of a crowd at the lido deck pool bar if the crew from Canada upholds there end of the bargain. lol and if you like to lie in the sun on deck you need to get out there early as people do tend to reserve chairs by leaving a towel on them and then not use them. ( Carnival says they have a no reserving policy but I see this type of behavior on all of the cruises I've been on)
Almost forgot, how many in your group? ages? names? what part of Australia your coming from? cabin deck/location? (room number not required, even if Cruise Princess tries to trick you into divulging it, lol ) Party animals or early retirees? we need to know these very important details...