I was quite saddened by the number of people who go to petra and only factor in a few hours, never going much further than the treasury. I appreciate not everyone has a lot of time in their itinerary, but that seems to be one part you should make the time for.
We had two full days there and it was such an extraordinary site to look around.
And I'm pretty sure there were about 5 "Best view in the world" :) Although all of them could make a pretty good claim to the title, it's a stunning area.