Ask HN: I'm looking for ideas for API or dataset projects to build on vacation

So my vacation plans fell through, I was supposed to travel but because of COVID, I've had to cancel. Which means I have 3 weeks to do absolutely nothing. I want to occupy myself. I'm not much of an idea guy, but am a seasoned engineer.

I want to work on building either an API or a dataset. Any field, the only requirement is that is it be useful to someone or some people.

So if you have any ideas on what might be worthwhile or useful to work on.. or even just lots of fun, please let me know. I have way too much time on my hands. Thanks.