How can I help my party find a secret path in a forest? [closed]

So, I’m trying to kinda plan out the main plots of whats going to happen in the next campaign. Currently my party are in a forest; they just got done traveling in the exact opposite direction of where they wanted to go, and found themselves back where they started at the very first session… rough, but they chose the path. Anyways to get the point, I want them to find a secret hidden path, in an area they’ve already been in, and that’s the route they originally wanted to go. its past a grove of trees; however its hidden in a valley, down the path know as the lowland path, however I cant think of anyways to help them go down that path. Let alone find the secret path. please help.