Fishing boat rehab
Picked up a beat-up aluminum jon boat and rebuilt it from the leaf pile up: new transom, deck, paint, rubberized hull, custom LED lighting. Held up to running it up on rocks. Came in over budget thanks to an unexpected trailer purchase, but still way cheaper than a new bass boat. Added real seating and a trolling motor a couple years in, then finally swapped in a bigger outboard. Learned a lot. Had a ton of fun.