Go downstairs on Katy's boat. Click on the sink and you will start talking to Katy. She will then ask you to fix it. Click on the cabinet underneath the sink. Once you fix the pipes, Nancy will find a card for a person named Andy Jason who works at Whale World. You can now ride Katy's bike down to Whale World and it will be open this time.
Riding the bike:
When you ride the bike, always wear you helmet.
Go to the hot Kettle Cafe. Once you have completed the other tasks you need to complete, Holt will ask you to help him solve a chess puzzle.
To solve it you must look in his duffle bag on the floor next to hi. When you open the book you can find the code for the lighthouse lock.
Sending the Phone Number:
The phone number you send with Morse Code. You have to go back to your laptop and visit internet, search for Morse Code, and copy Nancy's phone number in morse code somewhere (I used post-its to save any important information). Then you go back to the lighthouse and send it through the machine, via morse code. I'm not saying more since I think it's not the point, no fun in having everything told to you, now is it?