Besides, even if we assume they did island-hop (contrary to what experts believe),...
Wait a minute, do you know what experts believe? Then how is it that your only source is Wikipedia? And don't you think that your only expert, cited in Wikipedia, Thor Heyerdahl, did not even try to explain how the Polynesians calculated the route between their islands and America because they did not have the means for such a feat?
The travels you suggest require lots of things, not just capacity to carry food, water, livestock and maybe means to fish additional food. It requires the capacity to navigate with enough precision to find other landmasses. Otherwise you are just inviting almost certain death. Exactly what means did the Polynesians have to make a 2000 mile trip from one island to another island, and not get off course by a few degrees, getting lost forever in the sea? And what means did your intelligent dinosaurs have?
Anyhow, even if you ever get to convince anyone that Polynesians were able to do any transoceanic travel, you still have not even tried to explain how your intelligent dinosaurs from the
Cretaceous managed to propagate hundreds or thousands of species of dinosaurs, other animals and plants to all the other continents on an ongoing basis, starting in the
Triassic. Were they so intelligent that they created time machines?