I want to go stay in a hotel with my boyfriend. How can I sneak away and do that?

I'm 20 years old, still living with my parents. They don't approve of premarital and I have been taught to stay a virgin until marriage. My mother is concerned I would be going away and having with my boyfriend, when really the reason we're going is because we want more privacy. We are long distance and never get time alone because my parents have strict rules in their home. I want to tell them I'm going away but not that we will be staying in a hotel or anything like that. We don't have enough money to get separate rooms. I just need an excuse to get away for like 50 hours. Any ideas?