How do I get the boat down?

Hint 1 of 5:

Do you know where it's attached?

Hint 2 of 5:

Up on the Williams Bypass.

Hint 3 of 5:

There's a winch that will let you drop the boat.

Hint 4 of 5:

If it's locked, you can find a key in the Sandbar.

Hint 5 of 5:

[M]: You'll find the key on the counter of the bar.