I'd say yoga and pilates don't count as moving, although some of the more active forms of yoga might count as low-level cardio. They can be good for building core strength though.
I think walking is a good one, especially as it gets you outdoors. You might want to consider joining The 2012 Slow Movement challenge:
F 5 ft 3. HW: 196 lbs. Primal SW (May 2011): 182 lbs (42% BF)... W June '12: 160 lbs (29% BF) (UK size 12, US size 8). GW: ~24% BF - have ditched the scales til I fit into a pair of UK size 10 bootcut jeans. Currently aligning towards 'The Perfect Health Diet' having swapped some fat for potatoes.