At Eaton Canyon you park near the Nature Center, cross the wash and turn left to hike the many paths. At least it seems that's what most people do. The hike to Henninger Flats is especially popular. Or this time of year folks can walk in the wash itself. Later, after we have more rain (please), they can splash in the water.
If, however, you turn right past the wash, you cross under this archway. Pretty soon you'll find your way to a sign marking the entrance to Moist Canyon.
Boz and I like Moist Canyon, which right now is a name more than a description. I understand part of the canyon's near a Pasadena Police Department firing range but so far, we've found it to be quiet. And it's very good for sniffing.