Off of the Western Rim Trail, you can check out Top of The World; which is right next to the sand bowl. Then you can go find the Flintstone House. It’s a fun little easy drive.I've been to Sand Hollow where they hold the games. It's a wide open use area so you can use pretty much every inch of the dunes. A flag is required on your rig there.
The western rim loop is a simple but fun run for stock Jeeps. Sliplock and Milt's Mile are more challenging. Triple 7 has a difficulty of 8. Plenty of options depending upon your build, skill, and aversion to body damage.
Check out OnX it has many trails in and around Sand Hollow.