https://www.pcgamer.com/fortnite-follow-the-treasure-map-found-in-dusty-divot-location/

Week 7 of Fortnite Season 5 means new challenges and the release of the Road Trip skin. Since we're all sprinting to unlock it, here's where to find the battle stars in the 'Follow the treasure map found in Dusty Divot' challenge. The map depicts three trees, and those very trees are just a hop and a skip from Dusty Divot itself. 

Check out the map below for a general location, or the image below that for exactly where to look.