Well congratulations on your decision to choose such meaningful work. I am an RPCV (Returned Peace Corps Volunteer - I was in Central Africa about 10 years ago) and worked in international public health for several years after before recently returning to school to get a second degree in nursing.
Peace Corps is such a powerful, unique, and amazing experience and I highly recommend it to anyone with the will to make the commitment. As a trained nurse you will have a great deal to offer, however, as another poster mentioned, you will most likely not be actually doing clinical nursing - at least as part of your official job description. PC places volunteers in various broad categories (education, health, agriculture) where the main activity really is educating and working with local counterparts to build their own capacity. As a health volunteer, you will most likely work alongside village nurses and midwives and trained to do health education. Depending on your post, your counterparts - your distance from HQ
- you may also have many opportunities to perform clinical skills, but you're really not supposed to b.c. of liability reasons.
Anyhoo - my point is not to discourage you. PC is great - nursing is great - and so necessary! - and the two are a powerful combination for finding work in international development (which is what it sounds like you want to do)