This isn't really a series classic, but I found it watchable and enjoyable in what so far has been a shakey season.
The dailogue flows much better and is funnier than much of the season's offerings up until this point.
We get classic Cartman as he discovers the 'treasure' and plans to keep it all for himself.
[spoiler] It might come as a slight surprise that the real ManBearPig doesn't make an appearance, making a contrast to Skuzzlebutt the early, first season episode 'Volcano'. [end of spoiler]
All-in-all, not quite a classic episode, but quite a good one, with some funny moments.