Yeah, set your mind a task, even if it's doing some puzzles or playing a game that involves planning or strategy. If your mind is busy, it can't over think.
Or just go outside and let the awesome majesty of nature soak into you (a little more difficult in the months ahead, given). I mean, really soak it up. Take a close look at a tree or a fungi (lots around this time of year!) and examine the complexity of it and how it just all works brilliantly.
It's just a case of giving the brain something to do that's either fun or relaxing. Good news; the two things are not mutually exclusive.
It works for me.