Meroas hakemach (the flour cave) is a must. Its in the general area of Masdah and Ein Gedi. I went in the 80s with a local heimesher guide and his driver, but would not do so in today’s climate.
Contact SPNI so get with a tour that can get you there and back without getting lost (or kidnapped).
You can google them to see more info ahead of time. And keep klal yisroel in your tefilos!