How wonderful!
My thought is ... where do you want to go? When you read the newspaper, or watch a movie, which country/scenery/sight stirs your fancy, gets your heart beating a little faster? When you close your eyes and imagine yourself in a foreign land, where do you imagine yourself? Go there. It will be wonderful.
(A more structured approach might be to think about which of the following are important to you: historic sights, new cultures, meeting different "natives," meeting other travelers, hearing new languages, trying new foods, seeing exotic animals, seeing exotic greenery, seeing beautiful seas/mountains, physical adventure, etc., and choose accordingly.
NZ, Peru and Viet Nam are three popular destinations that score very differently on the criteria above.)