The item you get from 1519 AD is Edmund Hillary's climbing goggles (11 o'clock, 1953 AD). Go past the guards to the far right, where an old warrior will give you a mask. Wear it and the guard will give you the goggles.
The Aztecs are missing a piece of their Sun Stone, and you need to return it. The piece is in a chimney at the Thomas Edison house (9 o'clock, 1877 AD). Hop on the horseless carriage at far left, and push the start button on the back. It will stop under the trees and you can climb onto the roof.
The Aztec Empire is where you get the sun stone piece on Time Tangled Island. It is 1519 AD the picture is a man with headdress.
The Aztecs are at 1519 AD (5 o'clock on the time device).
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Go to the Aztec time (1519 AD) and talk to the old guy on the far right pyramid.
The piece of the Sun Stone is from the Aztec kingdom at 1519 AD (5 o'clock on the time device).
Time Tangled Island is on the site Poptropica. A link to the video walkthrough is provided below. For the written solution, see the related questions.
give it to the vikings and get the other items and for more info, type in 'How do you beat time tangled island?' in the answers.com question box.
If you "beat" the island, then the glider (a reward for returning the notebook) is already in your item bag.
There are no bad guys on Time Tangled Island. However, one of the guards at the Aztec temple (5 o'clock, 1519 AD) will kick you around a bit, because you are an outsider. Go to the far right and get a warrior mask from the old warrior. Then, not only will you blend in, you'll be able to complete the Island. That surly guard has Edmund Hillary's missing goggles! (11 o'clock, 1953 AD)
It's on top of Edison's roof in 1882 AD, where you return the phonograph. Bring it to the king at the Aztec time, 1519 AD.
The oracle is in the building on the hill on Time Tangled Island.
You go back to the lab then to the future in the big time machine get to your house and get the medal!