Fridge Logic: So they've got to fly 1500+ miles to Jamaica before the sun rises? Horror-Parody Writers Have No Sense Of Scale. Also, where's Cindy supposed to sleep when they get there? She doesn't have a coffin, and Dracula's didn't look big enough to sleep two.
Also, where had Renfield originally intended to ship the coffin to in the first place? Dracula's castle was confiscated by the Romanian government, so there's no place for them to live back in Transylvania except that threatened "efficiency apartment".