I never ran an official D&D adventure. I considered the Isle of Dread a few times, when I read the D&D BECM Expert rules, but there was little point in that - my players didn't want to play any D&D at that time.
The Isle of Dread cover showed that T-rex. And I wasn't sure wether to like, or hate dinosaurs in rpgs. Dragons were okay, but dinosaurs didn't seem mysterious enough. Although they probably are.