Will they have a relaxing, vacation mindset, or will they be party people? No way to know ahead of time.

I stayed there last year (as a single), and there was one other couple staying there as well. We never really crossed paths, as we were both in-and-out at different times.

Regardless, there isn't a "party vibe" at Kazanu. There's no bar, no restaurant, no music playing at the pool. Also, Tim would not allow it. If things got too loud or crazy, I'm confident he would intervene.