I did a mini cruise with P&O one November. It went to Zebrugge and there was a trip to Brugge. It was absolutely fantastic. Lots to do on the ship, and to eat, no chance of getting bored. Even went in the outdoor hot tub (yes in November!) great fun! It was nice getting dressed up for dinner, but we didn't feel under any pressure to do so. I'm looking forward to being able to book a longer trip next time.