@MattC Depends on what you feel... If you're after something creative then grab a sketchpad some pencils and doodle away, maybe move into people watching to draw if that grabs your attention. Maybe knitting or crochet?
Something physical? Skating, Cycling or just something like a gym class that isn't just pick up and put down heavy things? (I'm biased here, Zumba was hobby that turned into a passion/job).
Ooooorrrr.. the slippery slope of Trading Card Games.