Instructions
As soon as you exit Ventureland, talk to Smee. He is wearing a red shirt and sitting on the ground, crying. Smee will tell you about Captain Hook.
Head to Tortooga via the projector screen. You will spot Hook at the helm of the Jolly Roger boat as soon as you enter this area. You will not be able to board the boat until you complete all of the tasks in Tortooga.
Once you find Hook, you will need to defeat him. Jump Mickey across the floating barrels, then Spray Hook with either Paint or Thinner when he pops out of a barrel.