This article provides some useful links to determine the different visa requirements applicable for entry to Israel and how to find the nearest Israeli mission.
Most tourists enter on a B2 Visa that does not allow them to work and is valid for a short stay. Citizens of many countries can obtain their B2 Visas at the port of entry. Please review these resources thoroughly to determine your needs.
A list of contact details for the State of Israel's Diplomatic & Consular Missions
An overview of the different types of Entry Visas to Israel
An overview of the Visa Requirements from different countries