When I first retired I missed the routine and the pay check. Went back to my old side business of home improvements. Work was slow, more repeat customers for small jobs. Wasn't worth the insurance and tax probs. I've always liked and worked on old classic VWs, and I love to build trikes. Now I tinker on my 2 and maintain and repair lots of my friends. Occasionally someone wants me to build them 1 but nowadays it's a real hassle to register them legally thru DMV, so even that slowed down. I've now learned to slow down and take each day as it comes, not straying too far from the homestead.
I don't even miss the near non-existent income anymore(although I'm POSITIVE wifey would disagree!)