We went to Bruges on a mini-cruise this week, thought I would share our experiences.
We arrived at Hull far too early, I would recommend getting there no earlier than 5pm, we couldn't board the boat until then and there is literally nothing to do whilst you wait!
The boat itself was really nice, we had the cheapest kind of cabin which was tiny but served it's purpose!
We had purchased meal vouchers prior to the trip, we upgraded to Langans restaurant on the 1st night, really recommend, lovely food and very attentive service. However we were disappointed with the buffet which we visited on the 2nd night. I would definitely say it is worth the extra £4 to upgrade!
One more thing, make sure you take enough cash for the evening, there is a cash machine on board but it wasn't working when we were there (and it only works when you are in English water anyway).
Bruges was lovely, would recommend going up the tower in the main square (sorry can't remember what it's called). It was 8E or 4E if you are 25 or under. Also it's worth going on a canal trip, lasts about half an hour i think it was about 7E each.
If you are going here soon, enjoy!