Do you have house plants? They don't just look good , they can help lower humidity and improve air quality, especially in winter when windows are usually shut. It seems counterintuitive at first, a pot of moist earth lowering humidity, but plenty of them absorb water through the leaves.
Support your local library, they are a terrific resource, but are often a first target for economic cuts if not used, remember to explore fiction and non-fiction. They also often welcome general help for all sorts of things, story times, helping people use computers, all sorts.
I am a story teller, but there are all sorts of ways to engage with kids, and schools often welcome help as well, be it going in to give talks about something you know, like gardening, or helping on a one to one basis with kids like backward readers, it can be really rewarding,