Salou Travel Guide
Q: I was asked for my passport at a hotel in Tenerife, I did not mind showing it, but they wanted to keep it and return it at the end of my holiday... do they have a right to keep my passport? In fact does anyone ever have a right to keep my passport?
A: The official FCO advice on this is as follows:
Hotels have a legal duty to register the passport details of tourists when they check in. Wait until the hotel staff have registered your passport details or taken a photocopy of your passport, rather than leaving it in reception to collect later. It may help to take your own photocopy.