I did the above with my cousin last weekend and had a great time. We extended it to 4 days because she got pregnant between us deciding to do the ride and actually doing it plus I haven't been riding much over the summer due to the nutty temperatures here in Italy. I've posted some waffle and pics here: http://jeremy.contadini.co.uk/hadrians-wall-cycleway/ There are also gpx files on there broken into a 4 day ride in case they're any use to anyone. It was the first time I've cycled in England for maybe 16 or 17 years and I thoroughly enjoyed it. We're already talking about maybe doing the Yorkshire Wolds NCN 66 sometime next year.