economy.
i'm 24 and i went on a EF tour trip in 2006.
it was extremely tiring but well woth it and the tour guide was AMAZING!
we swore he was a super hero in disguise the way he would leave us walking one way and come back in record time from a different direction. and when a woman from our group was hit by a car in london he ran faster than i've seen anyone run to help her.
we even came up with a story about him and wrote it out and gave it to him at the end.