Be prepared for a long day it is worth it.
Started 5.30am finished around 8.30pm. NY Penn station very busy, staff friendly .
Train trip both ways comfortable ,
Washington DC train station has all the facilities you require ie food and bathrooms.
Bus tour : hop on hop off - at your leisure
Hard Rock Cafe
I couldnt fit in as many exhibits as I wanted too , one day is definitely not enough time
Enjoyable day and a must to see if you can spare a full day .