The other cavern is great for camping and I've spent many a happy evening sleeping in there with candles around the place.so get your hands in your pocket people.;)
Just a word of warning on this.
Re fires or cooking stoves.
Hot air rises and can dislodge material from a roof, and if the roof is high it can be fatal.
This describes the issue and consequences fairly well:http://www.telegraph.co.uk/news/uknews/5114591/Teenager-killed-on-camping-trip-after-cave-collapse-is-named.html
My avatar is a poor likeness.