Just an update. I purchased The Mayan Adventure book to compliment my son's NXT 2.0. He ran in to a problem early on. He did not have some of the pieces listed. I google the author and found an email address for him. He emailed me back within a few hours.

The Mayan Adventure was written in 2006 and is to be used with NXT 1.0. His second book, The King's Treasure, is written to be used with NXT 2.0.

I hope this can help someone.