Credit to Sonea for the idea.

The Black Lake lies behind the castle and though it may seem like the water is calm on the surface, you will learn that that is not the case underwater. Creatures have made it their home from Merpeople to Grindylows. The most notable is Bartholomew Henry, the Giant Squid. The lake is a beautiful place for you to hang out and….take a boat trip? A dock has been made by Mr.Cantwell and tied to it are 15 pedalo boats in the colors of the houses.

The pedalo boat is a pedal-driven paddle boat with a stirring wheel in the middle.The driver rotates a pair of pedals with their feet like bicycle pedals and it glides over the water. You can change course with the use of the wheel. An invisible barrier has been casted somewhere on the Lake, preventing the students from going too far. No worries though, once your boat hits the barrier it will simple turn around slowly.

Lifejackets are a MUST. Anyone getting caught without a lifejacket on, no matter how much of an excellent swimmer you are, WILL get brought back immediately by the Groundskeeper once he sees it. The lifejackets are a magical fit so no complaining that yours is too big or too small.

Be careful of Henry and have fun!