GlowBash 5K, Bristol

As the sun sets, cityscapes buzz with neon silhouettes as runners in glow-in-the-dark garb race through the GlowBash 5K's metropolitan courses. But the late starting time and futuristically clad participants are not the only things that set this race apart from other 5K trots. Competing in teams of two or more, runners must follow 11 clues provided at the start of the race that will guide them to a series of predetermined checkpoints and challenges. Depending on the route they take, runners can cover anywhere from 3 to 5 miles in a path that can take roughly 2.5 hours to complete. After the race, each participant receives a medal and access to a post-race party, where they can mingle with fellow runners rather than going home and jogging alone on their human-sized hamster wheel. The race benefits a local charity.