Horse Show 2011 - Artist sketchbook

I've always promoted this show as the BEST opportunity in LA county to sketch horses and riders... in the most beautiful and comfortable setting.....here's the shady hilltop overlooking all the action.....

And here's where I actually spotted a young artist! He had already sketched the llama and pigs at the petting zoo....
and had just started work on the oodles of activity along the path that skirts the show ring and the grandstands...
horses... dogs... riders.. kids... people of all ages...
Where would you start first?