Instructions
Jump along the small stones and the boats on the way to the main island. This path will lead Mickey to a small island guarded by two Splatters. Defeat them, then remove the bars with your brush to reach the first anchor. Use the thinners on the anchor, which will cause Smee's boat to rise somewhat in the water.
Travel back to the main island. Jump over the overturned boat and past several rocks, to reach a large blue rock. Hit it with with thinners, then follow the revealed ramp to the second anchor. Mickey will be spotted by a Sweeper. Run by it quickly or distract it with a TV, then climb the rocks behind it. Spray thinners over the rocks, to reveal an opening that leads to the second anchor.
Return to Smee's boat, and jump on the sand near it on the way to the last anchor. Climb up the metal sheds on the left, to reach a walkway. Jump along the masts and stones, using your thinners on the nests whenever you encounter them. This path will lead you to the third and final anchor. Use your thinners on it, to completely free Smee's boat.