The Scooby-Doo gang goes on an all-expenses paid trip to Hawaii that's being sponsored by the Goha Aloha-surf company, thanks to Daphne winning a contest to design some new swimwear for them. However, there is conflict surrounding this year's surfing contest. Usually it's open only to the locals, but this year the mayor has it open to everybody, including mainlanders, causing some conflicts among the contestants who happen to be locals. A few days before the contest, an evil creature known as the Wiki-Tiki Spirit and its little tiki demons attack, kidnapping a local woman called Snookie. Manu, the local surfing champion (aka, "The Big Kahuna of Hanahuna") and Snookie's boyfriend, agrees to help the gang solve the mystery of the Wiki-Tiki and rescue Snookie.
Oh, and Daphne's in the surfing contest.
This movie provides examples of the following tropes:
- Adam Westing: Adam West (duh) as Jared Moon.
- Aloha, Hawaii!: The film has Scooby and the gang go to Hawaii.
- Artistic License Animal Care: Scooby eats loads of macadamia nuts without ill effects. Macadamia nuts are toxic to dogs.
- Artistic License History: When Manu is telling the story of the Wiki-Tiki, he mentions that the first settlers to Hawaii were a group of Portuguese on board the El Guerrero looking for new lands in 1815. In reality Hawaii had already seen foreign contact in 1778 (some evidence suggests earlier contact between 1422-1664). Hawaii was soon established as a modernized Empire by King Kamehameha with the help of the British in 1795, but in Manu's story, it looks like the island is still in the stone age. Other problems include the ship known as, El Guerrero, which in reality was a US ship, later given to the Spanish, but never the Portuguese. The explorers depicted are also oddly wearing plate armour and morion helmets, as if it was set in the 16th Century, as opposed to the 19th Century as Manu claims.
- Bare Your Midriff: Daphne does this for the entire film—although it's justified in that she's probably wearing a bikini underneath her main outfit for the film.
- Convection Shmonvection: As expected in cartoons, the fact that the air near lava is just as hot as the lava itself is ignored.
- Cool Car: The gang apparently couldn't bring the Mystery Machine with them to Hawaii, but they got a rental car that has the same coloring scheme as the Mystery Machine does.
- Darkhorse Victory: To the villains, as Scooby unintentionally beats them in the surfing contest.
- Dramatic Thunder / Tempting Fate: When Molly Quinn tries to assure Mystery Inc. how safe Hanahuna is, she says, "You're more likely to get struck by lightning than become some silly sacrifice." Cue lightning suddenly flashing with some very loud thunder, followed by a downpour.
- Eccentric Mentor: Auntie Mahina; in spite of having the "dark shaman" reputation, she is very playful, quirky and extroverted. Lampshaded by Velma:She's a Shaman-she's supposed to be eccentric.
- Embarrassing Middle Name: After Fred claims, "Danger is my middle name!," Velma reveals that his middle name is actually "Herman," making Fred's full name Fredrick Herman Jones.
- Given Name Reveal: Snookie's real name is eventually revealed to be Pamela Waeaa, which is the name that she and Manu bought all the local property under.
- Innocent Bigot: Despite his dislike of mainlanders, Little Jim is rather friendly towards Mystery Inc. Also, near the end of the movie when the surfing contest is going on, when one of the contestants (a mainlander) wipes out, Little Jim goes over to him and helps him up, asking him if he's okay.
- Jerkasses: Pretty much all the non-local contestants is a jerk except for Daphne (who ends up entering the competition as a way to draw out the Wiki-Tiki).
- Lava Adds Awesome: There's conflict where the gang have to get past lava just because.
- Let's Split Up, Gang
- Mr. Fanservice: Manu could qualify for this—being voiced by Mario Lopez definitely helps.
- Ms. Fanservice: Daphne, even more so here than usual, since she's either in a bikini or a midriff-baring outfit for nearly the entire film. Manu's girlfriend, Snookie, could also qualify.
- Real Estate Scam Reveal: Manu and Snookie are ultimately turn out to be the culprits—and as it would seem, they were doing it to scare away both locals and non-locals to buy up all the property in the area and then sell it back to the original owners to make a huge profit.
- "Scooby-Doo" Hoax: The Wiki Tiki is really Manu in a disguise.
- Seldom-Seen Species: A nene appears near the beginning of the film, being photographed by Velma.
- Surfer Dude: There are a few surfer dudes here, specifically Manu.
- Walking Swimsuit Scene: Daphne spends a lot of screentime wearing a swimsuit.
- You Meddling Kids: Or, more specifically, "meddling mainlanders."