My son's current favorite thing to do is play outside, if we're not out there he's asking to go. Today most of our day was spent in the back yard and I'm loving it...he's even taking naps again!!!!
We have a pond in the back yard that's about 18 inches deep so I feel that he still needs supervision out there but if I'm extra tired, I can lay on a couch and see him playing in the sandbox or on his toys. I'll also open a window so I can hear him - which prevents me from falling asleep!
Ahhh, if only we could do this everyday - when our house sells I suppose we can, at least more often!!!!