so since you are going you need to take care of some business:
1. are you getting her a present?
I say no, keep her off balance
2. are you getting her parents a present?
I say yes a bottle of wine
3. what are your sleeping arrangements at their house?
I say you end up in the room with the brother or the dog
4. do you have patience?
you are gonna hate this time and get nothing while at her parents, but when you get back it will all pay off
5. how are you going to break up with her?
you need to start planning this now, you should have started your plan before you started dating
6. how sure are you that you are in control of this situation?
she may not be all that innocent and she may be luring you into some kinda trap, let someone know where you are going so they know where to start asking questions later, leave a trail of breadcrumbs and have a getaway plan