Having difficulty finding a unit I enjoy working in.

My first thoughts when I read your post is that you haven't really been anywhere long enough to actually know what working there is like. I think you've acknowledged that "job-hopping" doesn't look good to a potential hiring manager. Since you've never worked on any of these units independently that doesn't help. Critical care has a steep learning curve and each of the three units you've been on have very different foci, although there is some general overlap. If you liked PICU but think you need more time to grow your nursing skills and be comfortable in the role of "The Nurse" before building a career there, an outpatient clinic would NOT be of much value. Sure you'd learn some time management and some tricks for working with children but the patient population is very different, the work you'd be doing is very different and the skills are more of a soft skill set. You'd get more mileage from a peds medicine or surgery floor where you'd get solid experience with acute care pediatrics to build on when you move back to PICU. Give a lot of thought to how you're going to make this move without raising any red flags about your staying power. It might be in your best interest to stay with NICU for awhile longer, even though you're not loving it, just to build some credibility.