Really thorough flight planning, so that you can enjoy the flight instead of doing too much extra thinking.
I've found time spent preparing my flight bag, charts, kneeboard, planning notes make all the difference to the actual flight. One thing in particular is the information I put on my kneeboard - I use sheets made up myself on my PC that exactly suit the way I prefer to plan and fly, and whilst particular to me again make life much easier and thus more enjoyable.
That and less working hours and more money. (Or more flying in working hours).
G