Are there any extra fees that I will have to pay on top of the listed price?

No because every thing is included (transportation, refreshment and or lunch.

Should I print a receipt to show the tour guide?

Yes, A receipt need to be shown to the tour guide previous the tour.

What should I wear?

Comfortable walking shoes and clothing, including a hat and sunglasses (even in the winter months).

What do I need to bring?

Enough water for 5 to 6 hours. as well as protective sun cream.

What is the weather like in Israel?

From March to October 23-40 degrees. November to February 10-20 degrees.