I love 'ya Christi, but here I have to disagree with you. Not only is Tulum a beautiful place, but the history is fascinating. You really need a guide to explain what you are looking at, and how/why they built things the way they did. The lighthouse (and why they put it where they did); how the sun comes through the window in the temple at the solstice, their defense system, Tulum's place in the Mayan world, etc, etc, etc.
I love to venture out on my own to explore, but this is one of the places that can only be FULLY appreciated by having a guide. The Mayan people are very proud of their heritage, and it shines through whenever you have the good fortune to spend some time with one of them.
But, that's just my opinion............. and I could be wrong.