So how's this for crazy: Shira and I flew up to Boston this morning, met our 3 year old niece and nephew at the airport, and then flew back with them to DC. They've flown before, but it was so long ago this might as well be their first time in an airport.
Amazingly, this plan actually worked. The flights were all on time, the kids did amazingly well through the whole airport process, and nobody needed a barf bag. We even made it back to DC early enough that we had time to tackle a relatively small activity. We visited the NASA Goddard Visitor Center, which is essentially a small museum covering some of the work done at the NASA facility in town.
The museum turned out to be just what we needed. It was small enough that we could take it in without being overwhelmed, had some fun toys and demonstrations for the kids to play with, and had few pieces that the adults could be impressed with. The "Rocket Garden" made for an excellent area for our niece and nephew to run around in. As 3 year olds, they really didn't get much out of the museum, but then again, they probably weren't going to get much out of any musuem today. If you're a space/NASA fan or happen to be in the area, it's definitely worth dropping in. I wouldn't expect to make it the main activity for the day though, it's just not that large.
All in all, the Twins did remarkable today. As expected, they played really well with our little guy, and for the first time in a while, kids outnumbered the adults in the house. It's going to be an fun weekend, I can tell that already.
Now if you'll pardon me, I'm going to go collapse from sheer exhaustion.