We're going to York this Saturday by train. We're staying for three nights and we're looking for places to visit with our DD (6yrs) and DS (3yrs). Would Jorvic Viking Centre and York Dungeon be too scary? Thomas The Tank Engine will be at the Railway Museum - would that be worth a visit, as it is quite expensive? A lot of places are closed for the winter season, so does anyone know if there is anywhere else we could visit?