IMO, you didn't miss much. Bruce went back to camp with Casaya. He shows them all sorts of neat outdoorsey tricks which really boosts tribe morale. They go into the reward challenge and sort of gloat about him.
The reward challenge had four tribe members standing on a plank several yards into the ocean. The other 3 members stayed on the beach and had to use giant slingshot to shoot balls at their tribe members. The first tribe to catch 5 balls won reward--blankets, pillows, tarp and water jugs. La Mina won and they were allowed to choose the person from the other tribe to go to Exile Island. They chose Bruce because he had lifted their morale.
Back at Casaya, Shane tells everyone that a tree stump he found is "his" and no one else can use it and starts yelling at people.

This man is just strange. Then he and the blonde girl just start fighting.
At La Mina, they show how they're having a hard time finding food since they don't have the spear anymore--remember Sally dropped it in the ocean.
The Immunity challenge pits the two teams against each other to dig for bags in the sand. It was a very physical challenge with people pulling at each other and sitting on each other. It was really dumb, I just skipped through it. Casaya ended up winning.
La Mina was trying to decide who to send home: Ruth Marie or Misty. They eventually decided on Misty and next week we see that Sally is a bit upset by that. She and Misty thought they had an alliance with the younger guys whom they have been flirting with the whole time.