Scared? Shit no! Three days (five if you count the trip there and back) of climbing ancient pyramids, walking down into the catacombs to see the Tomb of Pacal, playing a slightly less deadly game (of soccer) in the ball court, exploring the jungle, watching real archeological excavations, etc, etc, etc. It was the adventure of a lifetime for a twelve year old, something straight out of Raiders of the Lost Ark....but without the Nazis.
A short hike from the main ruins, along a broken stone and tree root strewn pathway, are the stepped falls of the Otulum River. The pools are formed when sedimentary limestone is trapped by underlying rocks, eventually forming pools beneath each waterfall. The falls run for about 5km before coming out of the mountains near the modern town of Palanque. You could (and I did) spend hours wading from pool to pool stark naked and not see and single soul. At some point I stopped and snapped this with a little Kodak Instamatic 110 pocket camera...which I still have.
Nowadays, gaggles of shorts-and-sandal-clad tourists clammer off air conditioned buses, having traveled down freshly paved (and guard railed) roads. Hungover, pasty-faced, fanny-pack-wearing turista on day trips from any given cruise ship (or hippie wannabe eco-tourists) stop at the ruins just long enough to snap a few pictures, stare at the temple complex, stop at the gift shop, and climb back into air conditioned comfort. You can't climb the pyramids, there's manicured lawns everywhere, and you're not allowed to venture into the water.