Great Britain consists of three parts: England, Wales and Scotland.
What is the the most popular tourist attraction in your country?
When in England go to see Stonehenge, Oxford and Cambridge university colleges and London - the Tower, Big Ben, Westminster Abbey, etc. In fact, it depends on how long you can stay in England.
Surely you can find a few differences, like celebrating Helloween (normally nobody celebrates it in Belarus) or Christmas traditions. Or engagement and marriage traditions.