Can anyone give info on this event? - Escape NY bike tour

http://www.nycc.org/eny/

I'm looking for info on the Escape NY bike tour, specifically difficulty/elevation gains. I have a friend that signed up for the 50mi but is in doubt if she will make it. She found the 5 borough bike tour a bit tough and has a hard time doing Prospect park past 3 times.

I've never done the tour so I can't give her any advice but to expect it to be hilly. If anyone has done it and can help with ino, it would very appreciated.

Thanks,
Eddie