ClubPenguinInsiders.com provides a regularly updated list of cheat codes for "Club Penguin" as well as tips on how to make coins fast. From the "Club Penguin" homepage, click on Unlock Items to bring up a place to enter in the codes.
Club Penguin Insiders has lists of in-game Easter eggs that are otherwise difficult to discover. Item codes provide free items for characters, and coin codes add a fixed number of coins to users' accounts. Entering in every available coin code available provides tens of thousands of coins in total. Users can only use cheat codes once per account, but they do not need an account to enter in codes.