This trail is primarily used for people driving the 4 miles out to Font's point. It requires good clearance and 4wd. I just did this in my Subaru Outback, and the sand was crazy deep at points. You'll hear stories of people making out there in 2wd cars, but they were either lucky or had 4wd friends accompanying them. Big pickups seem to have what it takes too. The road way is hugely broad from all the tracks. Bring sunglasses, as the light off the sand is blinding. Choose your track carefully, and, if driving, keep your speed up so you can carry some momentum through the sand pits.
The why is that Fonts Point is one of those world class spectacular views that are 50% Grand Canyon and 50% Bryce Canyon.
For hiking, this is a easy one way trail to Fonts Point in California, but you'd better choose one side of the wash and stay away from the cars which are going pretty fast to keep floating over the sand (My max speed was 25 mph!) The right side seems a good bet because you'll be able to cut off some of the roadway bend and save yourself a bit of mileage on the way. It's Anza Borrego Desert, so be aware of the temperatures and carry more water than you think. I like to have good leather shoes to protect my feet from the many cacti.
Once you get to Font's Point there are trails along the rim of the canyon both east and west to enjoy before returning back the way you came.
This trail is located south of S22, also called the Borrego-Salton Seaway. From Borrego Springs, take the Palm Canyon Drive east until it curves north and changes to Pegleg Rd and curves again into the Borrego-Salton Seaway. Follow that road for about 4 miles and be on the lookout for the Font's Point sign on the right. There's plenty of parking next to the road or on the flat just off the road at the top. Hikers will likely want to stay to the right of the roadway so that you can avoid some of the mileage.
Bring sunglasses, as the light off the sand is blinding. Hats and extra water are a must.
As an adventure drive with kids, this would be great. As a hike, it's too long, boring, and hot to engage them. Consider one of the cool slot canyons like Palm Canyon Slot just 3 miles east.