One thing that is valuable is activities with downtime where you’re forced to get to know one another outside of the activity. If you do something like martial arts or rowing (which I do), it’s when you travel for competitions that you bond. Activities like skiiing where you share housing for the season gives downtimebto get to know people between the activity. Hiking and camping is another good one where you spend time at the campsite at the end of the day preparing food together.