I'm surprised nobody's taking on Super Mario 64, as it's very well easily possible to map using Toad's Tool 64. I sort of messed around with it and got these very low-quality low-res maps (below).
METHOD: Using Toad's Tool 64, I loaded up a Super Mario 64 ROM and browsed the different areas. Then I took screenshots of the areas using the top view. Or, if you want, multiple screenshots to make it more high-res.
It doesn't have to be viewed from the top, too. You can make cross-sections, view it from the side, make cross-sections from the side, view it upside-down, etc.
...just something I found out.