Deborah
I would suggest you have a look at what people have written ie on the reviews etc.
I have not been On The Vietnam tour, but I have been on 11 JY tours far and wide, started travelling in 2006. The type of tour I pick are action packed and your out and about all day seeing stuff...most tours I do you only get breakfast so look at the write up as if not all food is included you need to take money for food.
What to expect...go with an open mind do take in board it takes two people to have a conversation, someone has to make the first move.
Will people be friendly...like any group,of people there will be people you will bond with others perhaps not. I will say I have met so many great people on my travels and had great fun and laughs along the way.
Will you have fun...I would be VERY surprised if you didn't
Free time and company...free time can vary ..as time goes on and you get on with people then people do buddy up and spend free time together..or some people like being alone..I am happy in a group or by myself, on the USA tours I normally have an agenda of things I want to see so I am happy on my own or if someone wants to tag along that's fine.
Any other questions just ask...
Cindy