In my hospital there are 4 places with neuro kids. First, the PICU get all critically ill kids and we see a lot of neuro. Second, we have an epilepsy monitoring unit (EMU) where they do video EEGs, with and with out grids, nuclear scans with contrast during and not-during seizures, etc. Then the post-surgical neuro kids go to our general surgical floor, so these are things like EVDs or VP shunt revisions, spinal fusions and craniotomies that just need to heal and go home. Then lastly we have a neuro rehab unit that takes all of the TBIs and tumor resections and things that will need more long term rehab before being able to go home. Anyone seen by the oncology service would be either in the PICU or the oncology floor.
If you are interested in epilepsy specifically, then I think an EMU would be the ideal unit, since that is all you would work with. It is a highly specialized field and I thought it was interesting when I worked there. If you want an ICU environment there are some children's hospitals that are big enough to have a neuro ICU. We see a fair amount of kids where they can't stop the seizures and they have to be intubated to protect their airway. So it just depends what interests you most.