A royal decree allowed the Ministry of Commerce and Industry to lay down new regulations simply requiring women to show personal identification including a photograph, which hotel managers must register with local police, al-Watan said.
Tribal custom and hardline religious strictures limit women's movement in the conservative Islamic state, the only country in the world where women are forbidden from driving.
Saudi women can face harassment from the religious police if they are not accompanied in public areas by a male relative who acts as her "guardian". The rules are less strictly enforced for foreigners.
The paper said the rules, set out in last month's decree, were worked out in coordination with the Ministry of the Interior and the religious police organisation, two bodies who rights activists say stand in the way of improved women's rights in Saudi Arabia.
Concern over the country's image abroad and a desire to integrate women into the national economy have driven liberal voices within government to advance more freedoms for women.
King Abdullah has said he supports reforms, including lifting the driving ban, but only when "society" accepts it.
A Saudi delegation faced tough questioning before a panel of the United Nations Committee on the Elimination of Discrimination against Women in Geneva last week.