To print the map, right-click on it and chose "save as", and save the image somewhere. Then open it in a paint program e.g. Photoshop/Gimp/Paintshop and print from there. If you don't have such a program, you may be able to import it via word, and print it that way.
Worcester and Stratford as great places to visit, plenty to do for a visitor. Hope your son had a chance to see the Royal Shakespeare company perform in Stratford, I managed to see Macbeth there a few years ago, which was great. Hope the exchange students were good ambassadors, and you are right that mixing with people from other countries/cultures is very educational. The more I've travelled in the last few years the more I realise it, and the more I want to get out there and see more of the world.