Harvest Moon 64.
I may really like some of the hardhitters in that list (Ocarina of Time, Starfox 64, Super Mario 64, Super Smash Bros), but at the end of the day, the reason I got Harvest Moon 64 back then was for the same reason that Extra Credits covered a few months ago: it was refreshing to play a game where there was no violence at all. It was a game where the point was to simply live, and I found that game so much fun to play based on that one quality, even amidst the really great games on the N64's list.