One of Fortnite's challenges this week is lighting a Campfire, consuming a Forage Apple, and consuming a Forage Mushroom in a single match. It is part of the second week of Skye's Adventure and will be one of the 18 challenges you will have to complete to access its secret mission.
When you have completed the secret mission, you will be able to choose between a Ghost or Shadow style skin for Skye.
What makes this challenge difficult is that you have to do all three things in one game. There is a good place to visit to do it, but it could be a bit dangerous.
Weeping Woods and the surrounding area have everything you need and they are all pretty close to each other. The map below will show you where each is located.
The Mushroom is on the hill just past the purple bridge between Weeping Woods and the start of Slurpy Swamp. Then just down the hill you can find the campfire in the main recreation area. Now it's a bit of a trek to the apple, so keep an eye out for enemies as you walk towards it. You'll also need to run out of health to eat the apple, so grab some materials along the way in case you need to build ramps to get self-inflicted damage.
You can find screenshots of all of the individual locations below.