There's a few historic buildings still standing which all have a post where you can activate an audio-fragment to hear more about it. There's few orchards which are actually open to pick (free) fruit, check at the visitors center if you want to be pointed in the right direction.
We saw the orchards but they all seemed to be closed off. There were no signs saying open for picking, etc. Maybe we just were not looking in the right place. Also the trees did not look like they had much fruit on them. Schoolhouse was good. Just wish you could go inside instead of looking through the window.
Picking fruit in the desert? Really??? Yes! It was so much fun for all four of us (including our two teens). Picking implements and ladders are there for your use. You can eat what you want for free, and anything you tske with you is only $1 per pound. It was one of the highlights of our trip!
We stopped and had some fresh pie, yummy! Be sure to stop at the orchards and pick some of the seasonal fruit. We were able to pick apricots. Very different experience from other national parks!
There were apricot trees maintained by the NP service that you could harvest. It is so cool to be able to do this in the middle of the desert.