Great, easy walk close to the Phoenix zoo and with great views.
This is inside Papago park. After a short drive, there is a convenient parking lot from where you can see the hole (there are other mountains with holes but you will notice this one is oval shaped, longer and with people in it).
Walk a few steps to the "back" of the mountain where there are some steps on the sandy trail.
The whole walk takes less than 10 minutes. I did it wearing sandals and with my 4yr old niece.
Once you get up there, there is a great view of water and palm trees.
Absolutely recommended!