Explanation: If you would have said we decided to hike the canyon by themselves. Then you would be talking about some one else because you are using the word "them" But It clearly says (We) But when it comes to the word ourselves the begining "our" means us and us is like we. Thats the best way I could put it .
It is true that a well-written paragraph should be coherent and unified. These characteristic are some of the most important ones when it comes to writing essays.
