It's from the IOA Soundtrack, but it's not "The Wacky World of Jay Ward", or any of the other Toon Lagoon tunes. It's one of the Jurassic Park tracks, "Thunder Falls Terrace":
I think it's a great choice, really compliments the more Costa Rican inspired food selection they're serving.
EDIT: Someone who has actually been to the Hollywood park, were they playing any of the Jurassic Park music made for IOA prior to this?