We only had a very quick visit to York. This is because we had a little bit of trouble finding a park for our big motorhome, we ended up finding a side gate to a carpark & quickly opened the boomgate before anyone would notice.
We headed straight for the Jorvik centre & picked up some almond crossaints, apple danish & choc crossaints for breakfast along the way. 
At the Jorvik centre we learnt a little bit about how the Vikings lived & got to have a ride around a Viking village to see & smell what it was like.