Eden camp is an interesting place
http://www.edencamp.co.uk/
also the North Yorkshire Moors Railway (Heartbeat country)
http://www.nymr.co.uk/, The Yorkshire Air Museum
http://www.aeroflight.co.uk/mus/uk/elv/elvmus.htm or any one of a number of different museums in York, if you're in York in the evening I can thoroughly recommend the Ghost Hunt of York
http://www.ghosthunt.co.uk/
Hope that's some help (no I don't live in York - Lancashire born and bred)