Most people usually take the summertime period to spend some time and travel with their friends or families. Sunny weather, ability to get some holidays more easily since the company where you work is up for it (sometimes your firm will even be closed for a certain period in July or August), and a terrible desire not to stay locked up in a dark tiny office while other people are having fun somewhere on the beach or whatever. Going on vacation can be a wonderful way to strengthen your relationships with other fellows, especially when you are going quite far away.
As a matter of fact, the first thing is that you will be left alone in a foreign place or country. Concretely you will have to stay close and rely on the people who are with you to make it, whether it is about visiting some place or finding your way towards your hotel. The simple fact to share the same language as your relatives will be a strong link that will help you during the trip and make your relationship closer. Sometimes it can be an inconvenient since people who travel together tend to stay together all the time and are reluctant to spend time with locals. Did you go on a trip to discover some new stuff or just do the same thing with the same people but not at home? But this is another issue.
Then, travelling with your closest relatives, your wife or husband or best friend, will be the opportunity to create some unique recollections that you will remember for a very long time. Sometimes you will not even take a picture for it but still, it will remain engraved in your brain forever, even after ten years. Going away is a perfect way to create these souvenirs that you will have with no one else except for the people who accompanied you in this trip.
You may not avoid an argument or a misunderstanding, but this is actually part of the deal: different tastes, different choices, and your friend who wants to party all night long whereas you are willing to go to bed early because you have to go to the museum at 8am tomorrow, everyone experimented that and it looks funny afterwards. Yes, afterwards. But you managed to overcome such hardships, and to a certain extent, it can enable to strengthen your relationships with the ones you love as well.