https://www.gamespot.com/articles/fortnite-location-maps-search-between-scarecrow-fi/1100-6458797/

Season 4 of Fortnite: Battle Royale's Week 2 challenges are still available, providing players who own the Battle Pass with seven different objectives to complete. Some of these make use of new Season 4 gameplay elements (such as Hop Rocks), while others offer more challenging tasks that could require the use of a map. Here are the locations for all the key objectives and some tips on how to complete them.

Reward: 5k XP (after completing four challenges)