Some things I can't help counting. Stairs I climb, especially when I'm carrying my own luggage. Books I've read, so I can share favorite authors and stories with family and friends.
At the cabin, I watch the birds. Each year since we bought our cabin there, it seems like new species have passed through, maybe spending only a few days on their way to elsewhere, maybe staying the whole season. Eagles and ospreys are always around. So are owls. I rarely see them, but I hear them at night, calling outside the window. Ducks and geese change from year to year.
I started keeping a list next to my binoculars, especially those times when there were so many birds on the water, it's hard to remember them all.