Places to see in and around England?



Possible summer holiday map
Originally uploaded by viralbus

Our plan for this summer is to fill our Citroën C8 up with two adults, five kids, a tent, sleeping bags and lots of other stuff, and then drive clockwise round England, possibly taking a small detour to France and Belgium, and possibly another one to Wales (see the map).

We think the kids ought to see London, I would quite like to see Dartmoor, and a friend recommended that we take the kids to Bridlington.

However, I’m actually writing this because I’m interested in your suggestions.

Where should we go? Where are there beaches, museums, castles or rollercoasters that would thrill five kids ranging between 6 months and 13 years, preferably without breaking the bank?