Venezuela, supposedly from Spanish Prisoner, also i'm sure if you went to Argentina now i doubt anyone would give a rat's ass what you did, hmmm, judging from the list below i'd probbaly go with S. Korea...
but i did find this here http://answers.google.com/answers/threadview?id=27692:
Taken from "Extradition, US drug policy and the erosion of individual
liberties" by Howard Markshttp://www.drugtext.org/articles/912612.htm
"Countries which do not have extradition treaties but do maintain
diplomatic relations with the US are Afghanistan, Algeria, Armenia,
Bahrain, Bangladesh, Bophuthatswana, Brunei, Burkina Faso, Burundi, Cameroon, Cape Verde, Central African Republic, Chad, China (People's Republic of China), Ciskei, The Comors, Cote d' Ivoire, Djibouti, Equatorial Guinea, Ethiopia, Gabon, Guinea, Guinea-Bissau, Indonesia, Jordan, Korea (South), Kuwait, Laos, Lebanon, Madagascar, Mali, Marshall Islands, Mauritania, Micronesia, Maldova, Mongolia, Mozambique, Myanmar, Namibia, Nepal, Niger, Oman, Philippines, Principe and San Tome, Qatar, Russian Federation, Rwanda, Saudi Arabia, Senegal, Sudan, Syria, Togo, Tunisia, Uganda, Western Samoa, Yemen, Zaire, and Zimbabwe.
Countries which have neither diplomatic relations nor extradition
treaties with the US are Andorra, Angola, Bantu Homelands, Bhutan, Bosnia, Cambodia, Ciskei, Cuba, Iran, Korea (North), Libya, Maldives, Serbia, Somalia, Taiwan, Transkei, Vanuatu, and Vietnam."