My youngest (5 next week) loves Scooby Doo and this is amongst his favourite Scooby films. It has everything you'd expect from a Scooby film, lots of laughs, some outrageous characters and the gang solving the mystery at the end.
As a parent I also love the questions that this film has caused my son to ask, such as "Why do they only want the islanders to be in the competition?" or "Why does the smoke mean they are scared of the volcano?" ... he's been watching this film for years and this is a replacement copy so it was prior to the recent news items. However it did mean when they discussed the recent eruption at school he was fully armed with a range of knowledge on volcanos!
Well worth (repeatedly) watching and a bargain price.