Be prepared for long waiting times due to the extensive security checks on flights to and from Israel, so arrive at the airport in good time and where possible use the online check-in facilities provided by your airline. Make sure you allow for extra time if you need to return a hired car.
Some items may not be allowed to be taken out of the country: consult the Customs section of this site for more details.
You might want to close your bank account while you’re still in the country.