The first group of unsuspecting celebs were thrown out of a plane:
Anthony was quite literally shaking in his boots.
The second group tackled white-water rapids:
Some handled it better than others...
Finally, the weary campmates finished their first day with their heads in boxes of maggots, roaches and scorpions:
Yes, that's national treasure Val 'Prisoner' Lehman will a face full of mealworms.