It's really not difficult, and I'm not going to share a picture because each of the shady zones looks slightly different.
From the entrance there are two nearby shaded areas. Follow the boulders and cacti to the RIGHT, and then walk straight upwards after the second cactus.
Or you can walk forward about twenty paces forward, then walk to the LEFT and you'll find a shaded crevasse with blue water in it.
Remember to walk around in the shade to reduce your exhaustion.