As the saying goes, “it’s not where you go, but who you’re with”. This is so true and I cannot emphasize this enough. One tr might work for one of your mates, but going to another place with that same person might be a serious challenge. I also don’t really recommend groups, unless you pair off to do different activities. Just organizing dinner can take hours. Before you go, you want to discuss with your group budget, itinerary and adventurous attitudes. If you get on the train the wrong way late at night where no one speaks English, you want to make sure your partner can roll with the punches.