Complaining - requirements - bribes - I dunno
Jen it’s totally unfair that they sprung this on you with no warning. But think of it this way: your situation hasn’t changed substantially since before this offer. Your original plan involved doing schoolies without the belt, and then continuing your life without a car. The bribe adds a complicating factor but you’re free to choose to go on exactly as you have before.
The key question is, is the car being offered solely for wearing the belt those four days? Or is there an expectation for more permanent wearing afterwards in order to keep the car?
Yeah but the sand
Saintprudence I've been using her car a lot but I think that won't be allowed with the new one.
Yeah I'll see if there's any options but I gotta do the beach party one night
A practical suggestion:
What about asking your parents to accompany you? Not for the party of course and your friends of course must not know, so no embarrassment for you.
But you could in between disappear quietly from the party to their hotel room for a quick shower without belt to get rid of any sand etc getting trapped under the belt?
- Edited
EDIT: This is not just for Jen but a question open for everyone.
As the topic states 'bribes'....
If you were offered a car or another similar bribe appealing to your own preferences, would you in return agree to complete chastity (belt, thigh bands and bra) until marriage or studies finished (whichever comes later)?
I think you shouldnt comply with your parents wish in this case.
First they werent very open about it in their communication. Second they May use that as an example for the future to deny you access to the Key and put you under pressure with the Car. What about when you leave for college? They. May say: sure, but If you want the car tongi with you, then the keys will stay at Home.
And most important: this is against what I think was always your wishes and steps over your boundaries.
So be careful, Jen!
Jen It hides fine but I won't survive 4 days of partying in it
If concealing is not something that concerns you, that is fine, but it is still a fairly reasonable complaint to have. So maybe still make it part of your negotiation, but a part you can relent on.
If there is one thing to gather from the experiences you have shared, it is that your mother is over-eager, but can be reasoned into something you can consent to. So if you start with only wanting to wear it after sundown, and you negotiate her down to a single mid-event hygiene break, you can solve your most pressing problem while still making her feel like she won.
Jen I've never done 4 days. And never swimming at the beach
Your concerns are understandable, but I would consider agreeing. it seems like having your own car is a really small compromise compared to that. I agree though, this should have been discussed much earlier, ideally before you booked.
is it important to define the deal exactly, is it really 4 days to wear the belt there and then get the car? can you also enjoy the trip with a belt? how much does the belt affect the experience? make a list of advantages and disadvantages and talk to your parents again so that they don't have any evil ulterior motives and don't put you under constant pressure with the car
curious If you were offered a car or another similar bribe appealing to your own preferences, would you in return agree to complete chastity (belt, thigh bands and bra) until marriage or studies finished (whichever comes later)?
a very general question, I think it depends on what I'm being offered. I wouldn't want it for a small used car, at least until marriage (unless I have a partner I want to marry anyway). a porsche and a villa make the situation look different 
Angelina a porsche and a villa make the situation look different
Puh, you are really greedy. LOL
I picked the car as an example, because a car (no matter how old or shabby) provides a degree of freedom and independence in other areas of life, while being in the chastity gear takes away another part of personal freedom.
So a trade-off between two different kinds of freedom.
And getting back to your own situation. What about if you had been offered a car at age 16 (assuming driving at that age was legal in Germany like it is in the US or Australia)? Would it have been more tempting then compared to what it is now?
Getting a car for wearing a belt for a few days sounds like a pretty good deal to me.