One thing lots of tourists forget is the borders/ Northumberland 'castle belt'. Also, if you enjoy a night out, there is nothing quite like Newcastle.
/geordie mode off.
A night out in the Biig market, nothing finer than being vomited over by drunken, barely clothed, women whilst their boyfriends try and pick a fight with you. England has many attractions, and if you have a thing for the above then fine, however I suspect that very few would put it high on their list of things to do.
A list of things to do:-
Visit a few of the museums. Have a wander round the slightly less touristy bits of London, see the Bank of England, Lincolns Inn Fields etc and enjoy the architecture and history.
Visit one of the great houses, Chatsworth etc.
Visit Oxford or Cambridge
Eat at a back street curry house in Bradford, Luton or Southall. These are very variable so find some up to date local knowledge.
Eat at a Michelin starred restaurant at least once.
If you like the outdoors, get to the Peak or Lake district for a few days.
but whatever you do, unless you enjoy being vomited on by barely dressed drunken women as their boyfriends try and pick a fight, I'd avoid Newcastle city center on a weekend night.