Eye Mud Run, Palm Harbor

As if distance and mud didn't present enough of a challenge for runners, Eye Mud Run's muddied 5K course is lined with obstacles. En route to the finish line, runners must scramble up climbing nets and wade through a knee-high mud pit that is home to a mischievous mud creature who thinks it's funny to untie people's shoes. Despite those challenges, the course wasn't designed to be so difficult that it couldn't be completed. Runners as young as 13 and up for the adult race can sign up for the 5K course, and those who don't meet the age requirement can try their hand at the kids' 1K run.