u can go on the Advice spot for this if u want; I would be glad to help u out.
I'll just skip to the point, instead of writing something long: I think u should just be honest with her and tell her that u don't wish to go. I'm sure that she'll understand you.
Wait, can't u solve your own problems? Anyway, there is nothing wrong with camping...obviously from the other shit you've geplaatst u need something that will get u away from your stupid boyfriend and his stupid friend.
Do u know the only time I've EVER done something for the holidays? Oh wait, the last time was never. I hate camping, but I would KILL to go with my family.
If it's because u don't like camping, maybe consider it if u haven't already, at least for your mom? :]
If it's because u want to spend the holidays doing something else of just don't feel in the mood for it right now, just be honest with your mom, I'm sure she'll understand and be glad u were honest with her. :]