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The object of the activity is to get all members of the group safely across the river. They must go as one big group, not multiple smaller ones. Also stress that everyone must be on the river before anyone can get off the river, forcing the entire group to be engaged at once.
Participants cannot touch the water (floor/grass) and therefore must use rafts (cardboard squares) to cross.
The water is filled with piranhas. Therefor Therefore if someone loses their balance and touches a hand in the water it gets eaten(put behind the back). Same goes for a foot. If a person completely comes off the raft they are gone and since this is a team exercise everyone must start over. I recommend using this motto with the group, "start as a team end as a team."
You can also be creative and add challenges in as the group crosses. For instance you can say a fish jumped up and tail slapped someone in the eyes so now they cannot see(blindfolded). Tell them the river is acidic and when two people share a raft it tipped and now their legs are fused together(tie ankles together). Use these tools to help take away the natural leaders or more outspoken participants and it forces the others to step up and take on more substantial roles.
No scooting or sliding on the squares. This can be a safety issue and it emphasizes individual work versus teamwork.