^ I agree! I respect that your father has your best interest and concern in mind, but I think as long as you explain to him how CAREFUL you and your boyfriend will be (and that you'll call to check up on him often/frequently) I really can't see why he should say no. Unless he doesn't like the idea of you going off with your boy? D: Then you might want to make it seem like the two of you booked separate hotel rooms and won't do anything ~illicit~.
All the same, good luck to you! Don't give up
I'm sure if you also explain to your dad how important this is to you he should be willing to see your side of things.