The end of Over Logging, and the full episodes Super Fun Time and The China Probrem were actually the first episodes of South Park I ever saw.
My personal favourite episode of the season is the China Probrem, just because of how it had the characters overreact to Indiana Jones 4 like it's a great tragedy. That's South Park at it's best in my opinion, having people react stupidly to things.
Mayor Boobage is also good. Pervert Kenny is always great.