Sandra,
We contacted Senator Corker's office before we left and they were very helpful. They set up tours of the White House and the Capitol for us and also something called Tennessee Tuesday. Ever heard of it? They arrange for you to have breakfast with your Senators. I thought it would be cool for the kids to actually meet them. We're hoping to do and see most of the other things you mentioned. It all depends on how much stamina the kids have. Should be a lot of fun!
Jennifer