Someone is going on a trip...

We're ramping up for Ava's big birthday trip!!! She's riding the train to D.C. and spending 2 nights and 3 days in the nation's capital. She pretty psyched. We went to the library and checked out lots of books to prepare her.

Anyone have any ideas or suggestions for us relating to train travel with a 4-year-old or travel around D.C. with a 4-year-old? This would be a good time to share...