How do I get to the tower, then?

Hint 1 of 12:

Well, you have a general idea about what to do next:
Flood the city, that is.  See the previous question to figure out how.

Hint 2 of 12:

Now the only problem is figuring out how to get across the lake you're
about to create.

Hint 3 of 12:

Have you seen anything that might be suited for the job?

Hint 4 of 12:

There was a boat above that restaurant.  If only you could free it ...
(See the appropriate question in the previous section for more details.)

Hint 5 of 12:

Now, the boat is free to float, but unfortunately, it can float away.

Hint 6 of 12:

So you need something to reel it in.

Hint 7 of 12:

Did you look in the fishing rod in the restaurant?

Hint 8 of 12:

Well, there's a fishing line that you can take.