In the last week of May, I'm having a 2-Day event where 18 people I know are coming to my house to play Survivor: Trinity Fields. I did this last year with 13 people, and it was a lot of fun. I was wondering if anyone could help me think of some challenges or twists I could have.

Here's the basic layout right now:

18 People Left
The Amazing Race Challenge
-9 teams of 2 look for different clues spread about with 2 Roadblocks & a Detour. Last two teams to arrive are up for elimination.

15 People Left
The Apprentice Challenge
-This isn't really Apprentice, but the two teams have to create a 5-minute movie about anything.

14 People Left
Candy Matching (Reward)
-Lots of candy under bowls, simple matching game.
Triangle Treasure Hunt (Immunity)
-Triangles are the currency to buy their food. The teams have to find the money spread about, maybe blindfolded. The team with the LEAST amount of money wins, but they also need the Triangles to feed their tribe.

13 People Left
Giant Word Search (Reward)
-Teams solve a giant word search that has words relating to Survivor.
Pin Retrieval (Immunity)
-Teams must gather pins from other side of yard one by one. Then they have to make a giant triangle with the bowling pins.
Castoff Commercial Challenge (Twist)
-Castoffs have chance of getting back into the game by making a commercial promoting their way to get back in the game.

12 People Left
Charades (Reward)
-Teams have to act out words. One person from each team acts out the clue at the same time. First team to get it right gets a point.
DodgeBall (Immunity)
-Normal DodgeBall game with standard rules.

11 People Left
Sumo Wresting (Reward)
-One person from each team is picked to wrestle without knowing who the other team is picking. They have to have both hands on the pillow while trying to push the other out of the ring.
Worm Trail (Immunity)
-Each team is on a rope around a giant circle. First team to catch the other wins.

10 People Left
Blindfold Challenge (Reward)
-A blindfolded person from each team must find the colored blocks to spell Reward and bring them back to the team.
Water Bucket Throwing (Immunity)
-Teams must fill up a bucket with water by throwing a cup full of water to each player on their team.

*Merge*

9 People Left
Shootout Elimination (Reward)
-Each player has a box with their name listed three times on it. Players take turns shooting a ball into a box to take off a name. Last one with their name still on the box wins.
Missing Immunity Necklace (Immunity)
-The Immunity Necklace is hidden. First player to find it wins.

8 People Left
Tug o' War Tournament (Reward)
-Players square off.
????? (Immunity)
-Need a challenge here.

7 People Left
Leaky Cup (Reward)
-Players must fill a bucket by carring a cup full of water that has many holes.
Catapult Targets (Immunity)
-Players use a catapult to launch a beanbag into various targets for points.

6 People Left
Jeopardy Trivia Game (Reward)
-3 teams of 2 play in a Jeopardy style game with questions about castoffs and challenges.
Challenge Review Course (Immunity)
-Not sure what's on this....

5 People Left
Bowling Challenge (Reward)
-Player with highest bowling score using lawn bowling set wins.
?????? (Immunity)
-Need a challenge.....

4 People Left
?????? (Reward)
-Need a challenge....
Remembering the Game (Immunity)
-Intense quiz game where players have to remember EVERYTHING.

3 People Left
Endurance (Immunity)
-The 3 have to stand on one foot, hold a bowling pin in one hand, and a cup of water in the other. Last one to still be doing this wins.

2 People Left
Final Tribal Council


Do you guys have any suggestions, or any good twists? I really want everyone to be blown away by this. Maybe after it's over, there can be a prediction contest here or something to predict who wins.