If you're having a heart attack, call emergency services, don't post on Flyertalk.
Breathe in. Breathe out.
He can take the subway or an express bus. Easy to figure out using Google Maps. I'm sure he can figure it out.
Passport - leave the passport somewhere safe at the hotel. Carry a copy on you.
5. Anyone have any experience with a young person going on their own?Safety, etc?
Any help is great. I have not slept at all since he was accepted to go.
Any suggestions, tips etc. I am so worried, sorry for being such a baby.
Thank you very much
He's a 20-year-old adult. You are either underestimating his abilities or you have raised him in a very sheltered way. In either way, nothing you can do now. Let him figure it out on his own.
I've been travelling by myself since my late teens/early 20s. You learn as you go along.