If you're doing it to look good on a nursing application, consider this first:
Does your nursing school even count work/volunteer experience toward your application?
My school doesn't. My three years of being a CNA count as nothing (I think this is WAY wrong, but that's another topic). So make sure it's actually gonna be worth something before you go spending time on it you could be using to study or take more classes.
If it WILL count, or if you want to do it anyway for the experience, expect mostly to be running errands instead of actually interacting with patients, especially in a hospital. In a nursing home or other smaller (non-corporate) facility, you might get more patient interaction, which will be good for both them AND you - I think you'll get much more satisfaction that way. My recommendation would be to talk to an Activities Director at a smaller facility (most will have one) and see if you could volunteer to help out with their activities. When I did CNA clincials that's what some of us would do, and it was tons of fun