Bell Rock is located on Hwy 179, just north of the Village of Oak Creek (5 miles south of the junction of Hwy 89A and 179). Its distinct shape makes it easy to spot, and parking and trails are clearly visible. You will notice that the energy is strong as soon as you get out of your car. You don't have to do any climbing to feel the energy at this vortex. Notice the twisted Juniper trees all over Bell Rock. The energy at this vortex is very powerful and strengthens all three parts: the masculine side, the feminine side, and the balance.
Ok, let's look for some themes first. The vortexes say
unstable and chaotic to me, but at the same time, you've got
Its distinct shape makes it easy to spot, and parking and trails are clearly visible., suggesting just the opposite. Though I think it's easy to combine those, given that the place is also supposed to be about balance. So I think it could be that the immediate area around Bell Rock in the nevernever is exactly the same, it's the nevernever version of Bell Rock. It's stable, it's eternal, it's a beacon to anyone walking those paths.
The paths however are highly volatile. You can't really tell where they are going as soon as you take a few steps away from the rock. Most of the ways throw you back out at one of the other vortex points, as they toss and turn back and forth. But some ways lead you deep into the far reaches of the nevernever, where few people ever return.
Now a place like that could be inhabited, of course. Creatures feeding off the chaotic energy of the vortexes and using the stable rock as their home. Strange creatures made entirely of the same volatile magic of the vortexes, only sometimes throwing together a body of stray dust and plants to ward off invaders into their territory.
Rumor has it that some of the Native Americans could talk to these beings and even make peace with them, assuring a safe passage through the vortexes. (I don't really know any Native American mythology, but something along these lines should fit one myth or another)
***
A more interesting question would be: why did your players step through there? Are they going anywhere specific?