This fundraiser for the Royal National Institute of Blind People (RNIB) sounds more like a party than a challenge, with participants being splattered by neon 'glo-water' cannons as they walk, run or shimmy their way along the 3km route. DJs and UV lights will add to the excitement. A glow zone at the end will ensure that there's plenty of time for selfies before you rush to the nearest shower. Suitable for ages 10 and over. Registration costs £10, with a minimum sponsorship of £25.