I lost membership about a month ago after getting quite deep into the game. I'm therefore not letting myself get membership again soon, but that leaves plenty of extra spare time to work on the wiki. That's healthy, right?...
I enjoy focusing on individual pages that need care and maintenance, or simplifying long run-on paragraphs or sentences with unnecessary prose. That is opposed to, say, working on templates or categories across many articles.
I include short summaries for all edits, even though that doesn't seem to be in vogue around here at the moment.