That's actually a very good price for a full day tour inc lunch, entrances, guides, etc - you are driving to the other side of the country. Cruise Ships squeeze due to volume and sending 50 people at a time in a coach. Xunantanich is getting on for a two hour drive from Belize. I have a private Guide, Mark McField, I use regularly for mainland trips who takes a max of six with his own a/c minivan that includes Xununtanich in his tours at US$125 including Belize Zoo. He is a trained archeologist and was Tour Guide of the Year a few Years ago. Quality versus quantity.