Been retired for four years. Just did what i wanted the first year. Goofed off, goofed off, etc.
Then I started to get into bicycling, I bought bicycles off the internet, fixed, repaired, cleaned up, then sold them, made a few bucks also. I also bicycle a lot when the weather permits (no I'm not the spandex type bicyclist), for exercise.
I also take care of the wife to make up for all the years when I missed out on the family get togethers. Took her out to Broadway shows, restaurants in NYC. Spend more time with family. Went on good vacations that I couldn't go on over the years because of conflicts with my job schedule, and my wifes'.
Spent more time the years after retirement to really enjoy hunting, fishing, rebuilt the roof on the shed, and of course the dreaded "honey-do" list. This year I discovered Greybeards. I even went away to AZ & NV with a old military buddy of mine that I haven't seen in years. Maybe next year, I'll buy myself a bike (motorcycle) and ride, I haven't done that in a few years.
The bottom line, enjoy yourself, and keep busy. Don't worry, you'll always find something to do.