Hello and welcome to the Middle East
In Israel itself you have the Eilat area and the Mediterranean. let start from the Mediterranean, the visibility is not so great most of the time but its getting better from time to time especially before the winter, there is no much big life there but sometimes macro and few very nice wrecks, most of the dives are with boat from the shore, in the winter the water is quit cold (at list to someone who use to dive most in tropical areas)
Eilat, much better visibility, water temperatures from 22 to 27 so diving is all around the year. No much big fishes, a lot of macro options and fish portraits, there are few small wrecks (one is a battle ship - quit impressive), In Eilat I use most the Nikon 60mm micro, great for macro and portraits.
Also it very simple to pass the border to Egypt and go diving in Sinai, you have there the Dahab sites and Ra's Mohammad in 3 hours driving distance from Eilat.