There is also one non-official track which could see inclusion if it receives a visual overhaul (no pathing changes required) : Paradise Peaks. The only blend I've found is a 0.8 compatible one however :
https://forum.freegamedev.net/viewtopic.php?f=17&t=5631 . That version also doesn't have some graphical enhancements, but it shouldn't be an issue as it would have to be overhauled anyway.
Oh hey, I'm still getting some attention here years later. Neat.
I can probably dig up and upload the .blend file for the version I ended uploading to addons if anyone's interested in working with it. It'll still be a Blender 2.5x/2.6x file for STK 0.8x, but it might be a bit more organized and nicer to work with. It may or may not also have more refined drivelines— I designed the turns to be sharp and non-repetitive explicitly because I'd gotten bored of all the other tracks available at the time, but I don't remember whether I decided they were too sharp, narrow, etc and adjusted them after uploading that file.
Alternatively, you could get try getting an updated version from @xedgarx on the addons site, who seems to have ported it to the Antarctica engine when that was still new:
https://online.supertuxkart.net/addons. ... dise-peaksThe graphics would definitely need an overhaul, in not just aesthetic but also technical terms. Performance was quite bad in 0.8 because I made the clouds using hundreds/thousands of billboards; I assume that might be doable with custom shaders now? I also wrapped the entire mountain in a transparent shell in order to tile a fossil pattern (and a couple wall drawings) over it— I was aiming for a melancholic backstory of an extinction event, but I neglected the rest of the scenery for it, while increasing the rendering cost and covering all the solid stone with only two textures.
On another note:
While there's a lot of talk about "graphical enhancements" in both here and the ranking thread, it's not really clear what that means.
Samuncle had a really good visual style guide that described a graphical theme based on handpainted, cartoonized-yet-realistic textures inspired by Team Fortress 2; is that still official? Otherwise, I don't think saying "How beautiful [it] looks according to me" and "nice models", "nice textures" etc will be too helpful for any artists trying to help create a coherent game.