Much of what's important in life cannot be quantified, but data can be quite helpful for the journey.
One of my favorite books I read last year was Don't Trust Your Gut: Using Data to Get What You Really Want in Life.
The author Seth Stephens-Davidowitz shows that we tend to overestimate the happiness we will experience from engaging in passive activities.
It seems enjoyable to lounge around or binge YouTube videos, but such forms of recreation often do not provide much of a benefit. (I recommend just one minute.)
Many of the most underrated happiness-boosting activities take some work. Getting together with a friend for coffee or going for a hike takes some planning, but we are far less likely to regret such active forms of recreation.
Of course, knowing what's good for us is not the whole story. Never underestimate the power of human laziness. It takes some effort to get off the couch and achieve "escape velocity." (And it doesn't always go perfectly; just ask SpaceX.)
Still, knowledge is (potential) power for finding rest that will really nourish us.