I hate to say it but if you're near to DC it can be a good trip for kids. Lots of museums, some of them free, and a ton of public parks and memorials. Of course a lot of them are going to be jerking off the founding fathers and whitewashing history, but it might be a good chance to teach your kids about the other side of our nation's history. But there is enough stuff to do that you could probably completely avoid that kind of stuff all together. I can give a few more specific suggestions if you end up wanting to go there, lmk