depends on what you call safe,it depends on what part you visit,lots of places are fine,we have been a couple of times,dodging the rockets and buses,suicide bombers like buses,avoid places with a lot of people around and you should be ok.
i have just come back from israel (about 3 weeks ago)..
and it was safe,,, just avoid the area's were their is trouble,, ie do not go to ramala or to gaza (unless u know people their)...
also u do need to b carefull in jerusalem,,
u will love it out their