What a thrill

This is to get to the highest possible height, limted by the bounds of the 3D dimensions of the game map.

Its probably easiest to attempt this from the highest point on the ground, which you'll visit anyway for Peak gameplay. From there, you could build a hypertube cannon, or build ladders straight up into the sky - you can continue to build the next segments of the ladder whilst you're climbing up it so there's no real limit to how far you can go, until you reach the world limit of course.

Whilst you're up so high, save some time getting down again for That was a close one