I personally love trying to do impossible things just because! I literally spent over 18 hours mining obsidian nonstop! I've pulled all nighters to acheive things that aren't even real. (It's just a game!)
If were talking about my base? I love to just carve out mountains and create either some running tunnel network or make an enormous underground area. I also really love digging.
Here's some of my work I've done so far on season 5 of WilderCraft!