I agree with much of the above - family & travel.
I do think, however, once the kids are grown up and you've made enough money, then you
need to prepare for the 2nd half of your life. And that should be better than the first half.
It will require staying strong and staying healthy. In that pursuit, I spent lots of time doing stuff
like cardio & CrossFit. Hands down however - the best thing I discovered is weight training
via a program called "Starting Strength". The motto might be - If you want to stay out of the
nursing home - stay strong. Today at 68 years old - I'm stronger than I've ever been in my life.
And I feel 25 years younger.
Some of you might want to check it out: Starting Strength
I'll plug it by saying - it can change your life.
3X a week @ 90 minutes per workout will do it.
Here's a couple of videos.