i am trying to drum up some more ideas. I have a few so far:

buy coffee/tea for the person behind you in line
pay someone a compliment
smile at a stranger
bring lunch for a co-worker
buy coffee or tea for the bus driver
bring baked goods to your place of work
help out an elderly person
pack someone’s bags at the grocery store
donate books to the library
hug someone

I have more, but I would like some more ideas. Do you have any you would like to share?