Learn something new! Enroll at a class at your local community college. Have a friend teach you their favorite recipe. Take an online tutorial (they have them for just about anything). I just started taking an Excel class at my local community college and am loving it. Here is a picture of me holding my Excel manual in front of the building my class is in. I'm planning on signing up for a photography class later this month.
Taking the time to learn something new, whether it is a big thing or a small thing, will give you a sense of achievement and accomplishment. Plus, you'll have a new skill or a new set of knowledge. Congratulate yourself.
And that's your daily good thing!