I don't know if or how often this gets used, but a challenge similar to the tribe swap in Guatemala could be used.

Each tribe is asked a series of questions, such as "who smells the worst?" The tribe votes for the player on their tribe that best fits the category, and the person with the most votes gets a reward. In this example, the voted player gets to take a shower. This can also be done with idol clues or other advantages in the game, tribe swaps, and challenge advantages.

Juggling Numbers and Letters

In this challenge, each player will get one letter and one number. It is their job to scramble and find other numbers and letters to figure out the winning word. A number represents the slot in which a letter will go. So in the word jumping, 4 would represent the letter P.
(I suck at explaining so let me just show)
For example:
Person A gets 1B
Person B gets 2A
Person C gets 3T
This means:
Letter #1 is B
Letter #2 is A
Letter #3 is T
So the winning word would be "Bat"
But of course the word would be longer, and this challenge would be best for individual immunity as it'll show who is best socially and mentally.