Visitors are entitled to remain in Israel up to three months from the date of arrival, in accordance with the visa conditions issued.
An important thing to consider for tourist continuing from Israel to Arab countries with the exception of Egypt, and Jordan, the Israeli government recommends that you request that Israeli stamp does not appear on your passport. When entering the country in customs notify the clerk of your request before your passport documents are stamped.
No visas are required to enter Israel for US citizens. If your tour is a combination tour with other destinations, please contact the respective consulate or visa agency of your country destination in order to determine travel document requirements.
Additional information can be found at the Ministry of Foreign Affairs. You can also see the Tourist Visa Table provided by the Ministry.