I have had my share of Super Mario 64 dreams over a period of 8 years. The most recent one was from last month:
I (as Mario) was in some sort of a basement room (completely unlike any room in the actual game). In this room, I had to navigate my way through a maze full of glass walls (sort of reminiscent of the mirror in the upstairs room of the castle where you enter Snowman's Land, only I could actually see through the walls somewhat). Anyway, I had to navigate my way to the end, where there was a large picture of Bowser (since I woke up before reaching the end, I assume that I would have been able to jump into the picture [since in most of my other dreams, that was actually possible]). But, there were two twists: One was that the entire maze had conveyor belts as floors (like the ones in Tick Tock Clock, only they were red and yellow), making it difficult to even walk forward, and that Bowser was actually in the maze itself trying to find and flame me to death!
Man, those dreams are some of the best that I have had. I can't wait for my next!