We parked for awhile on the landing side of the "piano" (a huge drop fence) and then for awhile on the landing side of the big water drop fence. It was even scarier in person - a lot of stuff like this going on, especially with the smaller and less prepared teams.
After the Olympics were over, my trainer led a trail ride out in the Horse Park, and we rode around the 3-Day course looking for something to negotiate so that we could say we trained on the course. Couldn't find anything anywhere near SMALL enough. :-(