Israel is a fantastic place for photography. I went with a EOS 10D back then and had plenty of low-light challenges. Tripod is good if you are able to set it up and time your shots but it might not be a luxury if you have to move fast with other tour members. While it is good to travel light, I would say you might want to have a versatile range of lens to do both wide and telephoto else you might end up missing some interesting shots. Israel has plenty of opportunities for streets, architecture, and landscape photography. I think I had the 10D, 17-40, 70-200, and Manfrotto 190
during the trip.
In addition to equipment, bear in mind that certain places would require bags inspection and though photographic equipment is not affected, it does slow you down at times. Also, always keep an eye of your personal belongings especially if you are in very crowded places. Travel in group and look out for one another. Back then, i saw 2 locals tailing one of our church member who wandered outside the group. Good thing, we rushed forward and created some attention to disperse those possible 'pickpockets'.
Don't get to engrossed with photography but spend time in learning about the history of Israel and explore the place with an open heart. The promised land of God has many wonders even till today. My most memorable part was spending time with the Bedouin's and learning their culture and history. The dates tea is very sweet and is a welcoming drink during the cold weather (we went in December and got back home right in time for Christmas).
Dead sea is very interesting. Practically you will want to swim inside for the floating experience. Just don't get your camera into trouble when you are enjoying yourself in the dead sea.
Wishing you a wonderful trip and God Bless!
Daniel