Oh. A lot.
We actually live in the middle of a 3 gym triangle with 7 PokeStops within a 3-block radius of the house. Go a little bit further in one direction and we start hitting downtown. A little bit in another direction we hit Syracuse University.
We haven't done either of those yet and still .... since the morning of the 14th .... and considering I still need to sleep/work:
A couple of those km were actually on the bus ... but I'm guessing only a couple because the bus typically goes too fast to count.
We're getting exercise. (Just don't tell John.)