Yes, in Zion, a lot!!
But also on the right side of the Road (driving to Zion)
Not in the NP
But between Zion mountain ranch and the East Entrance
Perhaps you can look at Alltrails. A good site for hikes
The dispersed camping area is pretty open so you can walk the area. However, we didn't really find any hiking trails. Our focus while staying here was to spend time in Zion which is pretty close. The hiking in Zion is almost limitless. We did Angels Landing and several others. Couldn't do any of the slot canyon hikes Zion is famous for, because they were all full of water (spring run off). You'll love it!