Saying you want to do international law is about as descriptive as saying you want to be a lawyer. I took international law this year. The fact is that international law encompasses almost every other area of law. It's unlikely that you're going to be a generic international law lawyer. At most, it may mean that you'll be doing tax law with an international slant, or international trade law, or international human rights law. There are even some well respected lawyers who think that there is no such thing as international law. I disagree, but I think it's a serious misperception that incoming law students have that saying you want to do international law does much to define what it is that you actually want to do as an attorney. The key is figuring out if you want to be a trade lawyer, a litigator, a human rights attorney, a tax lawyer, a corporate lawyer, a securities lawyer, etc, etc. The international flavor of it is secondary to the actual area of law itself.