is there an organised trip anywhere in the NWi can take a group of 10 year olds?

its my sons birthday coming up and we're trying to find something a bit different for him to do. i did some caving in my 'yoof' and thoroughly enjoyed it. i though it might be a cool trip for a gang of 10 year olds who have done the bowling and laser quest to death.....
any suggestions?

You could try http://www.yorkshiredalesguides.co.uk/index.html