By the way, next time you want to go somewhere like this, go check out Anza Borrego. It's good to take an SUV (definitely not a brand new jetta ) but a lot of places you can go with just 2 wheel drive (no 4x4 needed). It's about 150 miles from Glendale ... Heck just the drive there would be great fun and there are a lot of places to just stop and enjoy the scenery of the desert. ...
... you take the 15 down to Temecula, take CA 79 South towards INDIO, then take the CR-S2 to Scissors Crossing. This are all paved roads but you will first love the drive on CA 79 ... but then REALLY love CR-S2. The desert there is VERY beautiful.
At Scissors Crossings, you can take the 78 back through Julian and Ramona back to Ocean Side, again, a VERY nice drive.
Heck you can even do all this in the Jetta! But beware that there's not much around on CR-S2 so don't start it with an empty gas tank and take all the necessary safety precautions if going alone.