For the Mayan Treasure, begin your quest at the Mayan Museum, where you'll pick up a silver necklace as part of the Geocache collection. You'll need to dust the center edge and under the word Exposition to get to the leaf fossil and the horseshoe. Now, to get the glass skull you'll need the key (which you'll grab by burning the newspaper), replace the skull with the wheel artifact on the table, and hurry on to the Dig Site. At the Dig site, burn the bush to your left to retrieve a pair of Jade Earrings for the Geocache collection. Now use brush on the entire area inside the ropes. Burn the bushes around you to get the sun and the magnifying lens, then break the rocks to get the mask and the millipede. Finally, use the box cutters to open the bag and get the red diamond.
As you journey on, stop by the souvenir shop and get the Sacrificial Mayan Dagger on the counter for the geocache (again). Then break the bowl to get the eggplant. Finally, click on the calendar picture. Place the calendar piece on it and rotate it until it fits. Sew this with the other pieces and when you're done grab it and go.
After getting the calendar, make your way to the Mayan temple where you'll need to light torches and squish all the scarab beetles around you. The geocache item this time is the Mayan Idol of a Sun God. You need to dust all sides of the altar and the left edge to get the warrior, elephant, castle and handprint.The painted gourd is inside the left box and the red diamond is embedded in the center altar.
From there, get to the temple of Tulum and grab the Mayan Sun Dial. Now you need to get 2 stone tablets and 2 ammonite fossils. To get the fossils, break the rocks on the side of the stairs and at its bottom. For the stone tables, you have to move the center tile puzzle around to show a man holding fire. The tablets will be places on the niche by the door to get you inside. Other items like the crystal chunk book and iguana can be attained by burning the bush, breaking the rock, and box.
Once inside the temple, light the vases with your lighter and get the elongated Mayan skull. The star is inside the rock to your right, and the sword is hidden with dust on the statue. Place the head on the statue and click on the symbols N S W E according to which direction the face is turned towards.