Ask HN: Between jobs for two weeks, what should I do?

My last day at my employer of 10 years is fast approaching, and I'll have two weeks of 'unemployment' before starting in the new role. I'm at a bit of a loss over what to do with that time, so looking for ideas..

I'm torn between planning absolutely nothing and just let nature take its course vs. trying to use the time as fully as possible (take an intensive language course for example.)

What would you do?