You can answer any way you want to. If you live in the U.S. you can mention states and/or countries or just countries if that is more applicable to you. If you want to list or somehow generalize them that makes it more interesting I think for others reading this post. I'll generalize about the U.S. states and just say that I've been to most of them expect for the New England states north of NY and except for the Gulf Coast states. As far as countries, I've been to Canada, Mexico, Costa Rica, Honduras, Venezuela, Brazil, Argentina, Paraguay, Thailand, Hong Kong, mainland China, Macau, England, France and Germany.