This is a build made in creative mode.
Using Immersive Portals and Pehkui mods, i tried to make this map full of weird stuff.

While the gamemode is creative, i recommend moving through it as if you were playing in Adventure mode.

The entire build starts right where the player spawns in, and signs posted along the way will help the player move through the locations.
As long as no blocks are destroyed, there will be only one valid path through the whole map.

There is no need to ever pick up any items, but some paths forward will be hidden or require an activation of a hidden button.

Expect a full walkthrough to take about 20 minutes, maybe 10 more minutes if you want to walk all the way backwards and out again.