Logical steps to deduce and conclude (correctly) that dinosaurs building boats is an incredibly unrealistic/stupid idea.
1) What would dinosaurs have built boats with?
If your answer is 'wood', see point 2.
If your answer is 'metal', see point 3.
2) How would they have felled trees and obtained lumber?
If your answer is 'head-butt trees then use claws to carve it down', see point 4.
If your answer is 'they are clever enough to build boats, they used axes to cut them down and make timber' see point 3.
3) Where would they have obtained metal? (For the ship and axe blade)
Obviously, the most common metal available is iron. However, it exists as Fe(II)3O2 or Fe(III)2O3. It must be purified by a redox reaction involving the reduction of the iron ore and the oxidation of the reducing agent. The simplest way to obtain refined iron from iron ore, is from a furnace. Coke or carbon is often used to reduce the iron ore. Since furnace temperatures can get extremely high (in the magnitude of many thousands of degrees), ceramic bricks such as magnesium carbonate or covalent substances insulate the furnace. In the furnace, iron MELTS, and is tapped off into bars of pig iron or whatever. Is there any evidence of 100-million year old furnaces such as this? Did dinosaurs live in a society with an education system, with schools where high school chemistry was taught? Does anything like this exist? No. Therefore, we can conclude that i) Dinosaurs did not build ships OR ii) Dinosaurs did not build ships with METAL. For those (unfortunately) still believing that there is a possibility that dinosaurs can build ships, see point 4.
4) Ok, they use wood only to build ships. How do they prevent the wood from being damaged from MONTHS of exposure to salty water?
Commercial timber is vacuum/pressure treated. I think it was the ancient greeks? (might have been another ancient civilization) that doused wood in olive oil to preserve it. But that does not prevent damage against salty water for months on end. And the ancient greeks never travelled long and far anyway. I could go on about some more chemical processes to preserve wood, but I won't because SURELY, the answer would be clear by now. Anyway, where would dinosaurs get the olive oil to treat their wood? Did they have a hierarchical system of slaves to collect olives and grind them in olive mills and presses?
Also, if dinosaurs were discovered to be able to build things like ships (or even rafts!), wouldn't that be a pretty big discovery? Surely ONE paleontologist would have discovered it by now? Wait! Every paleontologist, excavator, and people in related professions are ALL part of the conspiracy! Even the professors! OR large men with fair hair wearing sunglasses and a dark coat approached each and every one of them and told them to 'drop it'!
Yup.