Dock

The Dock is a beach-like area where penguins can play Hydro Hopper. The path to the right leads to the Town. The path to the north-west leads to the Ski Village. The path to the left leads to the Beach. If you move your cursor over the three tubes, they bounce up and down. The Dock is an open space of land with Hydro-Hopper equipment below.

Background
Due to its large empty space, it is often used by famous or rare penguins to hang out with other penguins, or usually a place for a number of players to hang out together. It is a very popular place, and was generally the most used (even when a party wasn't on at the time) room in Club Penguin after the Town.

Trivia

 * Apparently the Migrator use to be docked where the Hydro Hopper is docked as mentioned in Rockhopper's Journal, showing that Rockhopper had been visiting Club Penguin since at least early 2005.