For the products that can be recycled.... Let's say it's a wooden boat. Most of the wood would go into a landfill. There's no contamination and no hazardous material there.
The wood from the bottom part of the boat, where the keel is and where your engine and all your oils are, would be contaminated with oil stains over the years and all this stuff. This would go to a hazardous waste disposal site, where they would look after it. That's what they do. They will look after all the hazardous waste.
The oils and the glues would go to another recycling facility. The metals would go to a separate site for recycling. That's how this works.