At least some of those structures are the teepee and fence rail structures illustrated in the 'Cat & Mouse' challenge diagram. The challenge board shows Day 13 - 'Rehearse Cat & Mouse' which is the day after the switch. For this to be one challenge, either 'Cat & Mouse' was moved several days up the schedule, or 'Cat & Mouse' was to use the same recycled course like those recycled coconuts were used in both episode 4 challenges.













