During my time with this game as a kid, I used to find a lot of cuts that can save some time. A lot of them are just minor seconds but there is also a very big one.

Northern Valley

Dusk Valley (Weekend race only!)

Moors

Highlander Road

Bamboo Forest

That is all the cuts I found out in the game, if I missed any I will do another post about them. They might save seconds but they are worth it. Especially Shipyards, which saves minutes. Try them out in a speedrun!!