Sentence 1: Sarah was excited about going on the trip. 
 Sentence 3: They had all bought tubes to float down the river in 
 Sentence 4:  The day came and they all jumped on their tubes in the river 
 Sentence 5:  They spent the day floating, relaxing, and having a good time 
 Option 1: They decided to go boating on a river. 
 Option 2: Her and her friends were going to float down the river.