The twilight volcano tour is well worth the money. Me and my wife were on honeymoon, there was a group of about 8 also with us. Matthew the tour guide was one of the most knowledgeable people I think we have ever met, he knew everything and it made the trip very informative, not just about the volcano but also about wildlife, plantlife, landscape, the evolution of hawaii and where it is probably going to go. That man deserves a pay rise. The climax was the volcano crater at night which is an image which will stay with me and my wife forever. We were lucky enough to be up there on a very clear night so we could also see the stars and Milky Way etc.. All in all - incredible.