The Cleanup. Dot the I's and cross the T's
As much as I enjoy the instant satisfaction with a physical cleanup, I actually enjoy documentation. It's a great way to decompress and review the equipment/location I just worked on.
I can't tell you how many times I spot issues or recommend changes as I document. the odd time I can find solutions to existing problems. I always make it a point to document whatever i;m working on so I have a point of reference and for my clients. Just in case I'm not around and someone else needs to figure something out.
Documentation doesn't have to be anything fancy with multi-layer Visio drawings. Even a simple Powerpoint with some squares and lines with notes is good enough.
Heres a photo of my desk with my 3 monitors: so I can have all my information up in front of me.