Canyon Sin Nombre is a 8.4 mile lightly trafficked out and back trail located near Julian, CA that offers scenic views and is rated as moderate. The trail offers a number of activity options and is accessible from November until April.
A nice hike through a narrow canyon with many geological features. There were many people there when we hiked it! The "trail" is a jeep road which gets quite a bit of traffic. A nice walk from the road or drive a mile to the canyon opening. Went in the fall, spring would be best due to lack of greenery.
I've made this trip quite a few times. Will probably go again thanksgiving weekend. It's a blast. Fairly easy with a non modified 4x4 as long as you take it easy in some of the rougher parts. The mud caves are one of my favorite parts, I can spend hours going in and out of all the little sections. There are some high points you can climb to, and get a pretty good view around. Highly recommended for a family trip to the desert. Also Aqua Caliente is nearby if you want to hit the hot springs.
Awesome trip to take for a day off road. Its a wash type off road with a few rock gardens, need some ground clearance for the first rock garden.. Love the mud caves and explored in some of them which was amazing. Bring a headlamp if you plan to do any exploring!