I'd been wanting to take the kid (or, to be more honest, I'd been wanting to go) to the new playground park in Fairfax, VA, called Clemyjontri, for about a year.  One of our friends took her kids, and they couldn't stop talking about it, so I used that and my son's birthdays as excuses, and suggested all the boys meet up for a playdate at the park.

Which is pretty awesome.  It's a county park, but was privately funded in order to provide a playground for disabled children.  As a result it is quite lovely and manicured, with lots of open space.  My son could have spent 8 hours just playing on the one slides-and-climbing unit.  Several of the swingsets were designed so that wheelchair-bound children could use them (modified swings with straps, etc), and the carousel had a large percentage of non-mobile horses and a few wheelchair cars - and was in plane with the floor.

It was really cold and REALLY windy, and there were only a few other kids there (none with obvious disabilities), so I still don't know what that interaction will be like.  My son used to see wheelchairs and say "Look!  That's cool!"  Last time he saw a person in a wheelchair he said, "What's that man?"  So while it could be embarrassing for me, I think it would be a good social learning experience for the kids.  As long as my 3-year-old doesn't shove someone on crutches over in his race for the airplane toys.