When I used to work in magazine publishing, one of my editors told me one of my best qualities is my insatiable curiosity. Admittedly, it's hard for me not to learn as much as I can about something I'm interested in.
I like to be outside. Backpacking, camping, hikes, etc. I did a 35-mile leg of the Wonderland Trail (Mowich Lake to Longmire) in August which was really... well, wonderful. Crossing my fingers that I can do the Enchantments this year. I got myself some snowshoes recently. Total impulse buy (which is rare for me) but after going once last year and loving it, I thought it would be an OK investment and have already been out a couple times this year. If you have some shoes, let's go out in the snow!
I don't ever want to regret that I wasted my time while the sun was out. Or even if it wasn't. That being said, lazy Sundays inside to recharge before the work week are also often needed.