The only answer isto go this time and make her friends determined to NEVER invite you again. I've included a few handy hints to help you below :
* Whilst erecting the tent, set the tone for the weekend. Kick pegs, stamp on parts of the tent that don't fall into place shouting "CUNTING, FUCKING SHIT IDEA THIS IS" Storm off at least once.
* On the first night, drink yourself into a stupor. Aim to throw up between acouple of tents. Embarrass yourself and missus by recalling your first 69 as a couple by the campfire.
* During the night, people will struggle to sleep. They'll drop off in the early hours. This is when you need to stagger out of your tent, cock in hand, pissing as you go before letting out a blood-curdling scream. If anyone ventures out to see what's up, tell them you heard voices.
* An hour later, wake them all again to ask if anyone has any shite roll. Tell them to hurry up as you can't snap it off without a sink to wash your hands.
* Fuck off on your own in the car for breakfast before your missus or her mates wake up. Return as they struggle to warm up some beans. When your missus asks where you've been, tell her you've had a full english and it was bastard lovely. You had to put something back into your stomach after 'shouting colours' the night before.
* Begin drinking almost immediately. With a bit of luck, they may throw the towel in.