The "arch" is the draped doorway between the 3rd and 4th lights. There are 5 markers, and three jewels that indicate which of the five street lights should be turned on to reveal the map piece. The jewels mark the 1st, 2nd, and 4th lights, but they should be turned on in the reverse order, right to left : 4th, then 2nd, then 1st (the one nearest the dock).
There are no cheat codes on Poptropica. (see the related question)
The combo is 312.
In Golden Harbor, turn on the 5th, 3rd, 4th, 2nd, and 1st lights in that order. This will prevent you from turning the wrong ones off.
The lights at Golden Harbor have to be turned on in certain sequences, or some go back off again. You need the 1st, 2nd, and 4th to be lit. The sequence of lighting them can be 4-2-1 or 2-4-1 (this may have changed since the island was opened).
what are the waterfall nature ARCH CODE
The non-existent address at Bouffant Bay is "312 Hanging Fern Lane". The code means to hit the hanging fern baskets in that order. Hit the third plant, then the first plant, then the second plant, and the map piece will fall out.
At Golden Harbor, the map piece will appear in the curtained doorway between the 2nd and 3rd lamps. Light the 4th, 2nd, and 1st lamps in that order (considering the 5 lamps from left to right).
The Nedbank Melrose Arch branch code is 198765. This code is used for various banking transactions, such as electronic fund transfers. Always verify with the bank directly or check their official website for the most accurate and up-to-date information.
The zip code of Liberty Island is 10004.
The country code and area code of Anjouan Island, Comoros is 269, 71.
The country code and area code of Moheli Island, Comoros is 269, 72.
There is no known security code on Nabooti Island.