Let's say by "didn't need money" you mean I have an income that is enough to fully support my family and keep my home in good repair and even make home improvements (we need some big repairs to gutters and fascia, deck, HVAC, etc.) That's not a small number especially factoring in health care... but let's assume it's taken care of and all our needs are taken care of, and I even have a little disposable income for IT, music stuff, books, etc. I could continue with the things I've done in my limited free time for decades:

- writing non-fiction and fiction - making original music and podcasts - developing educational hardware/software projects - developing my own programming languages - continuing to refine and catalog our large home library - gardening and transitioning towards growing more of our own food.

I'd spend much more time involved with my kids since my wife and I already homeschool, but I can't put very much time into it now.