Great Treasure Onizuka
Eikichi learns of a hidden treasure somewhere on one of Okinawa's islands and decides that a special class trip is in order. During the expedition, Anko and her friends tie up Noboru to leave him in the jungle, but end up getting lost in the process.
Aired 30/07/2000EP 38 - Great Treasure Onizuka

GTO: Great Teacher Onizuka
Onizuka is a reformed biker gang leader who has his sights set on an honorable new ambition: to become the world's greatest teacher... for the purpose of meeting sexy high school girls. Okay, so he's mostly reformed.
However, strict administrators and a class of ruthless delinquents stand between Onizuka and his goal and they will use any means, however illegal or low, to drive the new teacher away. Perfect, because Onizuka's methods won't be found in any teaching manual; he cares about the difference between legal and illegal activities about as much as he cares for the age difference between himself and a high school girl.
So get ready for math that doesn't add up, language you'd be slapped for using, and biology that would make a grown man blush... unless of course, you're the Great Teacher Onizuka.
Note: Episode 1 has an airtime of 48 minutes.