Not to be missed, even by non-hikers. There is a generous parking lot and a cement walkway that allows access to several viewpoints. I have been there when the air quality was so bad that the view into the valley was greatly restricted. But after the rain and winds that hit the park this week, the view was the clearest we've ever seen.
If you do nothing else, check out the San Andreas fault, which is easily seen in the valley from the viewing platforms on a clear day.
A very pleasant and quite moderate hike. The descent into the Pushawalla Palms area can be tricky (lots of loose rocks) for a few yards... but then the oasis is awesome. If you don't wish to do the whole loop because the second half (southern portion) is not as scenic as the canyon itself, you can go back the same way when you reach the metal fence at the mouth of the canyon. Very pleasant and easy to reach trails system!
It's a good hike to do in the area - right on the San Andres Fault - pretty cool unless the big one comes while your there. The main attractions are walking along the elevated fin (don't venture into most of the canyons along side - more dull there). However, make sure to go to the Pushwalla Canyon at the end of the hike to see the palms, and the valley at the end. It should be mostly an out and back. Don't go anywhere close to summer, way to hot (except where the Palms are). No dogs, even on leash.