I Got off onto the Wrong Foot... Again! Part 1

This is the 1st episode of Survivor: Jamaica - Second Chances

Challenges
Reward Challenge: Skull Crush One person from each tribe will race to the other side of the island, where they will find a pile of skulls. They will break one skull open at a time, looking for an amulet inside. Reward: 1st Place; Flint and extra rice and beans. 2nd Place; Flint and beans, 3rd; Flint Winner: ?

Immunity Challenge: Lock, Load and Light The tribes must run up and over two sand mounds, assemble a puzzle boat, using unique braces to hold it together, row out to a cauldron, light a torch, row back, remove the braces, and take them to the starting line. Two players will use 16 puzzle pieces to assemble blocks representing compass directions, then the tribe fits the blocks and braces into a climbing wall and climbs up to light a fire bale. The first tribes to do so would win. Winner: ?