Skinny Dip. This is my favorite Carl Hiassen novel. The lead female character is smart and quick, and the supporting case of characters are one of the most entertaining entourages I've ever had the pleasure of reading.
Roy starts a new school and is constantly getting attacked by a bully. One day while getting attacked, he spotted a weird running boy who he started chasing after. He discovered he was called "Mullet Finger". Roy, Mullet Finger and Beatrice (another student) became friends and embark on a quest to save endangered owls in a local construction site.