Camping - I come from a camping family and DH, DS and I used to camp quite a bit. That was BC (Before Cats).
Walking - I try to walk outside every day for at least three miles. In the summer, I enjoy mowing the yard with our push mower. We have a riding mower, but DH uses that. I just love walking. Some Saturdays, we used go to a state park and do some hiking, but not often anymore; we always seem too busy...and that's a shame.
Swimming - We have an inground pool, but I don't use it often anymore.
Gardening - That should count! We enjoy gardening, whether it's our flowerbeds or our veggie garden. I just like to be outside even if it's just pulling weeds.