How do I convince my mom to let me stay one night with my boyfriend?

Anonymous
So my mom did something really sweet, and she bought my boyfriend and I 2 day park hopper tickets to Disneyland for Christmas. This was really sweet of her, and we're both really grateful that she gave us such a generous gift. We wanted to save them and use them to celebrate Valentine's Day. The park is about a three hour drive from my house, and we wanted to stay in a hotel one night so that we could have the two day experience, and not have to drive three hours back home after a long day at Disneyland.
Now.. my parents aren't fond of the idea of me staying in a hotel alone with my boyfriend. They flat out told me no when I brought up the idea. I'm 19, I still live with them, and I truly understand that whatever they say goes, because they're still providing a house and food for me. My mom is also the one who bought the tickets after all... But that doesn't make me not want to have a little romantic vacation with my boyfriend for two days. They don't consider me an adult, regardless of what the law says because I still rely on them.
I think it's a little ridiculous that they're being such sticklers over 1 night, considering I've stayed the night at my ex's house before with their permission and they didn't even like him. My mom loves my current boyfriend and tells me all the time that she's glad I'm with him.

I respect their opinion, and I will not go and spend the night if that's really what they want, but I'm trying to figure out how I can convince them to let me stay the night. Any suggestions?

Thank you for your help!
How do I convince my mom to let me stay one night with my boyfriend?
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