a good rule is that you should still be able to see the soil the plant was grown in after back-filling the hole. i am not sure the pan needed to be greased, but i am a cautious baker. for a $1,000,000 account, that is the equivalent of losing $15,100. the buildings will not be open, but there are plenty of great photo opportunities from outside. fortunately, it was the cliff wall that we walked into and not the top edge. it tasted good going down, maybe, and coming up it was a relief to get the awful feeling gone from your body. 