Just an afterthought to my earlier post - if you did go on a day trip coach or bus excursion, be aware that the queues for the portakabin type loos by the parking area can get very long indeed in the afternoon as people start to gather to get back on board!
Wouldn't want to put you off going - it's quite a unique experience, but IMHO the days when it would be worth staying overnight there are back in the last century sometime. A bit like Vai in Eastern Crete, which when I went in 1980 was already over - run.
Rob