Woman going out on a mixed trip without a mahram
Question

                Is it permissible for a woman to go out on a trip in which men and women mix from morning until evening, without a mahram?.
Praise be to Allah.
    Mixing of a woman with men is haraam, and we have explained 
    the evidence for that in the answer to question no.
    1200. 

    If this mixing is on a trip where people are more likely to 
    be relaxed and start chatting, then it is more serious and harmful. Hence it 
    is not permissible for a woman to go out on such trips, even if there is a 
    mahram with her, so long as there is careless mixing; and her going without 
    a mahram is more serious. Whoever agrees for his sister or daughter or wife 
    to take part in such trips is lacking in protective jealousy and is weak in 
    religious commitment. We ask Allaah to keep us safe and sound. 

    And Allaah knows best.