Characters - R.O.B, Wario, Daisy, Peach (Yeah, I was really good with Peach in the N64 version.
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Courses - All of the retro N64 courses, and Waluigi Pinball... Maybe some others.
Battle Track - Block Fort, without a doubt. I remember playing for HOURS on it in the N64 version with my bro... Good times, good times... But Pipe Plaza is cool, too.