Packing list
Packing list has many suggestions. But bring majority of it. Clean clothes, toothbrush/toiletries, $, etc.
Dress code per school regulations. Please don't tell make me tell you you're wearing something inappropriate. Bring one outfit that is nicer for the Capitol. It doesn't have to be super fancy. Just no t-shirts and sporty shorts (like basketball shorts). Bring a swimsuit. Remember to bring your Class shirt.
I would bring two luggage type bags. One big, for clothes
(which will be in the storage area underneath the coach and
non-accessible and then one smaller bag (backpack) that you can bring on
the bus and will be with you in your seat.
$$$ - All main meals will be covered. Everything else is on you. We will be at places for souvenirs and other things as well.
Umbrella/Rain jacket - it rains in DC a lot. Hopefully not when we are there! Everyone hope for NO RAIN!
Charger for you electronics.
Everyone know and memorize your home phone numbers or parents numbers. We had an issue with a phone being lost last year and the student didn't know his house phone or parents cell phone numbers.