The primary attraction here is the wild Takhi horses. There's no need to spend the whole day looking for them. They hide out high in the hills during the day, but they come down in the evening to drink. If you show up at 5pm, you'll have plenty of time to find them. Just look for a cluster of cars pulled over to the side of the road or a crowd of people with binoculars and cameras.
There are other things to see here, of course -- eagles, antelope, etc. -- but the horses are the main attraction.