The easy answer is that it really depends on the friendship. Knowing whether or not your friendship can survive travelling - not just a simple holiday - will really make or break a trip. It can be a really great way to celebrate the end of an era, organising a trip together to fill the dark days that follow graduation and the end of university living. But what is it that you want to gain from travelling? If its meeting new people, pushing yourself outside of your comfort zone, and testing your limits, then going with the comfort blanket of your university friendship group maybe isn’t the way to achieve that. But if a trip to make some life-long memories with the people you have spent the last three years surviving student life with is what you are after, than doing the uni-friends travelling trip is more than ideal.
Any group holiday requires a certain amount of sacrifice...
However some friendships are meant to go more global than others. When deciding to say yes or no, ask yourself these three things: have I been in a stressful situation with this person before? Have I successfully resolved conflict with them? And, most of all, do we enjoy doing, eating, and experiencing the same kind of things?
If the answer is yes, yes, and yes, then its a no-brainer. But if there are some reservations, do tread carefully. Any group holiday requires a certain amount of sacrifice, whether that's deciding which attraction to visit that day or what time to leave the club that night. You want to make sure you’re with people you can rely on in scary situations, safe in the knowledge that your friendship will survive the inevitable catastrophes.
At the end of the day, some friendships are just for home and the comfort zone. And that is okay. It doesn’t mean the relationship looses its value in anyway. But when you are travelling a new place that has a new language, culture, food, people - you want to be surrounded by the relationships that will only grow deeper, and not stretch and break.