Nigel. CIOS have a Jersey site. Tourism's site is at http://www.jersey.com/
I am also a 'Friend of Jersey' Tourism, so must declare bias.There are also a number of private musuems and collections. The best being Ian Cabot's museum at St Ouen, the L'Etacq end. TWO 3 WHEEL ENIGMAS!! There are also feild works at L'Aleval, known as the 'German Road' and above it at Les Gillietttes. The north coast from Les Lande's round to St Catherine's has various sites on the coast. La Houge Bie has the prehistoric monument and a bunker. As you might gather plenty to see. The Island is 5 miles x 11, bigger when the tide goes out :-D There are also Napolionic and earlier forts, including Martello towers, St Aubin's Fort Elizebeth Castle and Mont Orguil (NOT GOREY Castle!!) Have a nose at Google earth.