Go to the parking garage. find you have to go to sewer 3
Coords for me was 3,6 (or 6,3). It was on the far left path and up
Read and go to the docks
When you play against ahab, eat the altoids first (hoburbia, tin can alley flea market). Equip the bowling shoes, heal yourself, and use the bowling ball to play.
You will bet him and win