The goggles are on one of the Aztec guards. If you go to the top of one of the pyramids there, an old retired warrior will give you a mask, and if you put that on the guard will give it to you.
If you want goggles on poptropica go to the time travel watch and click on the Indian King and get the mask put it on and go to one of the guards and he'll have goggles and he'll ask for a trade and...