I did this program 2 summers ago! It was pretty amazing! As all internships, you get what you put into it so ask questions, connect with whomever you are shadowing, and have fun. It was really relaxed... I would even go out for drinks and watch the World Cup after work! We also got to observe autopsies, births, and daily discussions/lectures by doctors and other professionals. I will be attending Hunter's DPT program his summer, so having experience in NYC really cemented my desire to work/live in the city as a future PT!
P.S. lunch is NOT free!