The most underrated act of kindness is simply letting people be. Let them mispronounce a word, talk too much about a show they love, or get excited about something you don't quite understand. Everyone has something that lights them up, let them shine, even if it's not your thing.
as i get older, nice weather is really something precious, something to enjoy, and something to talk about. like yes, this is a big deal. this sun, this light breeze. this is big.
i love washing my face in the shower. no water running down my arms in that really annoying way. no water on the counter. significantly more enjoyable experience