Hopefully this helps the OP, as well! OP has some good options/decisions to make. I see that there are mixed reviews, but it's still helpful. Knowing what TinaBean said, I will make sure I take an office job at some point, PRN or otherwise, to help prepare me to be an FNP. However, I'm going to stay in the ICU for the duration, as well; I have only been there for a year thus far (nurse for 2 years), and I do enjoy my job, and feel loyal to the unit (really good nurse manager, etc).
Since I work in an adult ICU, I will probably take a PRN peds office job in the future, if available, to give me some experience with children. We'll see, though. While I like children, I prefer working with adults, but I'm trying to broaden my experience for possible FNP jobs later. If there's an outpatient PRN oncology job, though, I will jump on that.
Thank you for the advice!! Good luck OP!