I'd definitely recommend not leaving your passport or driving license with anybody, or your credit card either.
We work with the Sant Moritz chain of shops and they take a swipe of your credit card as a security for the skis, which is deleted as soon as the skis are returned.
Ski hire shops generally take some kind of security for equipment they rent out just because the equipment is expensive and they need to ensure they get it back. If you don't have a credit card then I'd suggest leaving a cash deposit, which would normally be equivalent to the amount you would have to pay if you didn't return your skis.
Whenever you rent skis I'd also recommend making a note of the reference numbers of the skis so you know you have the correct ones. This isn't just to make sure you take the correct ones back at the end of the week, it's also because your bindings will be set for your size/weight/experience so taking the wrong skis can cause you to have an accident or injury.
We work with the Sant Moritz chain of shops and they take a swipe of your credit card as a security for the skis, which is deleted as soon as the skis are returned.
Ski hire shops generally take some kind of security for equipment they rent out just because the equipment is expensive and they need to ensure they get it back. If you don't have a credit card then I'd suggest leaving a cash deposit, which would normally be equivalent to the amount you would have to pay if you didn't return your skis.
Whenever you rent skis I'd also recommend making a note of the reference numbers of the skis so you know you have the correct ones. This isn't just to make sure you take the correct ones back at the end of the week, it's also because your bindings will be set for your size/weight/experience so taking the wrong skis can cause you to have an accident or injury.