People travel the world to find the best dive sites with the most colourful fish, but everyone's missing a trick. You see, the best snorkelling opportunities are right here in the UK, in the town of Llanwrtyd Wells in Wales. Every August the town hosts the Bog Snorkelling World Championships, a wade through a deep mud- and water-filled trench. Parents gather along the side of the bog, cheering on their athletic thirtysomething kids. It's like the school swimming gala, minus the verruca socks.