What Should I Bring On My Tour Through Europe?

I am leaving for a 2-week (Guided) student tour of Europe exactly two weeks from now. I know the essentials that I need to bring (Toiletries, Hat, Charger, Adapter, Exchanged Currency, etc.) but I want to make this trip fun too. I'll be able to take three bags (I can check one into the plane and I can take two carry-on bags).

What I'm already taking:
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Laptop (Web surfing and editing/posting vlogs for/on youtube)
Camera (Nikon D5000) (I have a pocket sized camera, should I bring that too?)
Go-Pro (Action Camera)
Phone (We're temporarily changing my plan for international calls)
Water Bottle
Backpack (Possibly taking a 2nd one as my other carry-on bag)
Headphones
Pillow (Flights and Train rides)
(Possibly other things)

It would be awesome if you included necessities that I might not think of too!

Thanks!

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