I've got a long weekend coming up with my son Adam, aged 18, who has learning difficulties. He loves visiting canals (colourful boats, locks, cafes, slightly eccentric people...) and cycling along towpaths. We're staying near Warwick so I'd be grateful for advice about which canals have got towpaths good enough for him to cycle on (not too much mud, not too much grass, not crumbling away into the canal). All I know about in that area is the Grand Union Canal from Warwick Parkway Station to Hatton, which is the kind of towpath that Adam is fine with. What are the towpaths like further afield on the GUC or the Stratford Canal?