come to the Winter Solstice - the Druids will do a 20minute "service", and you'll be expected to be on best behaviour whilst they're going to the North and to the South, but it's not compulsory, and you can pretty much do what you like in there for about an hour
worth going at least once, a most extraordinary place - until you get right in there, it's just a postcard. *Inside* is a totally different matter ...