They haven't really cleared away any of the dense jungle from the perimeter of the structure. The temple's stairs are overgrown and crumbling away so you climb the pyramid via a makeshift set of scaffold-stairs they've built alongside the structure.
...we hiked our way through the jungle again for a bit to Tikal's Temple IV. Built in 741 AD and standing 212 feet tall, "Temple IV is the tallest pre-Columbian structure still standing in the New World."