Bring a large pot of lightly salted water to a boil. Add macaroni, and cook until tender, about 8 minutes. Drain, and rinse under cold running water.
In a large bowl, mix together the mayonnaise, vinegar, sugar, salt, pepper, green onions and jalapeno peppers. Stir in the macaroni. Refrigerate until chilled before serving, at least 30 minutes.
