Building a ramp for my mother's dog - who can't use the stairs - to go up and down the stairs in our backyard. Both V1 and V2 took a weekend, but V1 was disassembled to use for some other stupid thing in the backyard, and V2 is slightly better and more portable/storable for future dog visits.

I know it's a common trope among software developers, but working with wood and making something physical just feels immensely satisfying.