If you have gone to Chichen Itza or Tulum, you have seen the typical Mayan ruins. Ek Balam, recently opened (in 1996) to the public, is smaller, more secluded, surrounded by jungle, and definitely less disturbed by tourists.
We took this tour as one of the two offered by Palace Resorts with our package. There are six to choose from. Our guide, Rafael, was very informative and considerate of we older gringas who needed to be out of the tropical sun, stopping to lecture in every shady spot he could. While I would not climb the great pyramid at Chichen Itza, I did attempt the smaller one at this ruin and was well rewarded with a magnificent view of the jungle surrounding the ruins. Coming down is very steep so wear good walking shoes. Since heights bother me a bit, I came down backwards, which was the method of choice for several of us timid folks.
The tour included a stop at a native center where we watched ladies hand knotting hammocks. I bought a huge, beautiful one for $20 -- a real steal. Don't be afraid to bargain!
Lunch was also included, but while good, it was not of the same quality as the Moon Palace. This trip takes most of a day, but is worth the time.