Yes, it will probably be full, but we were on Wonder in October and never felt it was crowded. But we hit fall break, so there were a lot of kids on the ship, more than we are used to. Overall, a great ship and Royal knows how to build it to make it not feel super crowded. windjammer at certain times was crowded, but that is normal. Just don't worry about it and go have fun, always places to go if you want peach and quiet.