Do you get to take your own horse?
I know that when I go away (without my horses) I get extremely upset - up to the point where I get nasty (i know its bad) about people who tell me to stop being a wuuss. And I leave.
If you are taking your horse (which im guessing you might be???) then you probably wont get too homesick - I know I don't, I see the horse as a homelink... I agree with Crackrider as well, I take photos of my family with me - it does help.
Didnt they give you a list as to what you should be taking? Like how the teachers used to attach a 'what to bring' list to the itinery on our school camp forms. ? Or are you just enquiring as to what you should be taking in case? Oh well...i think im confusing myself - lol, anyway, Have a RIPPER of a time! Good luck, and I hope you don't need that masking tape :P