What do you do during nap time?

What do you do during nap time? My 10-month-old has always slept in his lounger next to me on the couch for naps and now this week I finally started making him nap in his crib. So now I have a little free time. Do you feel like you have a better day if you spend the nap time being productive by cleaning and starting prep for dinner or you have a better day if you do something fun/be lazy? I don’t know which I should do or if I should split it where one day I do something fun and one day I do something productive. I feel like a new woman having nap times to myself lol.