I was thinking about this a bit yesterday and I think the most feasible way would be to suspend a glass sheet above the lake, and then give people harnesses with magnets on the top that attach to magnets on the other side of the glass sheet. Then just put ball bearings on both sides to reduce friction.
I think it’s fine to have some less commonly used actions be only accessible through a terminal, even on more user-friendly distros. That is basically what Minecraft does, and yet no one’s scared of that.