Minecraft wiki entry for Nether_hub, associated text: Ice path – Replace the floor with ice (blue ice is best but very expensive) to sprint-jump super fast if your portals are far apart. You can even use a boat on blue ice to travel around 60 blocks per second! Try limiting your fps to 60 for a cool effect of staying still)
Strider path – Put lava into tunnels and set up places for striders to park. Using warped fungus on a stick, striders can be used to travel in tunnels.
Signs – Mark how to get different places using signs at the intersections. (best in multiplayer if others will be using your path as well.)