Indeed 7 CHF for a normal parking space / sleeping place, make sure that you buy a new day ticket around 8:00 am if you want to stay a little longer. Otherwise you will be judged. Toilet and shower are behind the kiosk but can only be used when the kiosk is open (until 21:00). Beyond that, it becomes a dixie. Shower in hotel ambassador was fine, but 10 CHF p.p. You can light a fire next to the playground for a fee.
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