I am not on this tour but have down a few JY tours of the USA..I am a vegetarian and have had no trouble finding food to suit my needs,did you mention you were vegetarian when you booked, if not contact the sales team to note it on your records, then your food on the plane will be vegetarian option, and they will know on the records for when your out there for joint meals that you might be having. I always take a few nibbles with me, like cup a soups to have in the room just in case I have gone hungry..
Re Couples,I have been on 6 JY tours and have never seen a couple as in Man and Lady, but as Olly says some time couples are there as in friends travelling together, I have travelled on my own but have met a couple of ladies who I have travelled with since, but I do still travel on my own as well. I have a husband at home but he does not like this sort of holiday.
Cindy