Sentence 1: The entire group of teens clambered into the raft. 
 Sentence 3: None of them had ever done this before, but they were excited 
 Sentence 4:  The guide lead them down the river and the water started churning 
 Sentence 5:  They had such an amazing time on the river that day 
 Option 1: They were going up the river, headed for white water. 
 Option 2: They were going down the river, headed for white water.