Walk
general journal junk
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idealog
Create a list of items to find during your walk - certain kinds of plants, a house of a particular colour, certain kinds of ephemera, etc. And while you're doing it, track your steps on a fitness app and set a goal for steps and found items.
You could design a specific map or routes to follow for your adventures, and mark your progress. Getting a black and white map would be good for this, because you could colour in routes you've taken, neighbourhoods you've visited, and sites you've passed. Choose a new route each time to keep things interesting.
If you're walking with a friend, you could jazz the scavenger hunt up a little and make a bingo card out of of your hunt. This would give you some space to add easier to spot items. The one who makes a bingo first has to pay for the post-walk coffee and snacks!