We stayed in North Wales for one week, and checked out Snowdonia National Park (hiked up Mt. Snowdon), cycling on the Isle of Anglesey, castles at Caernarfon, Conwy, and Beaumaris, the seaside at Llandudno.
The second week we made a loop through northern England checking out Manchester, Hadrian's wall between Carlisle and Hexham, the city of York, then spent four days in London seeing the usual tourist sites. Watched a football game (soccer for us Yanks) which was a lot of fun for my 14 year old son who's an avid player.
It was my first time in the UK and the first overseas trip for the rest of my family. We all had a great time. I think my older son took about 1,500 pictures with his new Canon T2i. I've assigned him the task of creating a short compilation of all of our pictures and I'll post a Pix01 link when it's ready.