Buy all the necessary for a cookout.
You can gather your own wood and just start cook out fire.
It was a fun and good way to meet new friends like the Argentinian Elizabeth Keitelman who won the first prize in a painting contest with her paint about "Impressions of the Dead Sea"
Visit the deserts. There are three deserts in Israël: Negev, Massada and Herodium. Herodium is more like a huge desertmountain. Massada is easily to reach from Engedi. It's best to go organized or with a guide at least. Getting lost here is very easy.