My advice, after almost 10 years of retirement, is to let your retirement routine evolve. Determine what you genuinely enjoy doing as opposed to what you (or others) think that you should enjoy. I found that a lot of what I enjoyed while w*rking was a salve for the stress and wasn't necessarily enjoyable after retirement.
I've accepted the fact that I enjoy doing a lot of nothing and that is OK. If someone needs me to do something, I'm there, but "productive" activity for the sake of looking busy or the appearance that I am using my time wisely doesn't cut it with me anymore.
YMMV
So well said!
For me, it was helpful to keep my schedule fairly clear of obligations, so that I could fit in doing "a lot of nothing", as travelover put it.
Actually, instead of nothing what I was doing was shedding stress. For some of us the stress shedding takes months to years. It's like peeling an onion - - you get one layer off and then there's another beneath. But you'll get there and it's a lovely task.
Another thing that was helpful to me, was to make a rule that I had to get out of the house every day. Otherwise I might have become a recluse. Being an extreme introvert, I could see that in myself, hence the rule. Also, planning to go out of the house and knowing where I am going, gives my day some structure. For example... "Monday? Why, that's gym day, so F and I will go to the gym, work out, have lunch, and then home." Then the rest of the day falls in place. For me that is better than mentally freezing up, not knowing what to do, and feeling like a fish out of water.
Working on my fitness was a pretty high priority for me. I was shocked to discover first hand what effect years of cubicle life can have on the human body.
We thought we would want to go on long trips by car, but neither of us did. We were too busy getting more fit and shedding stress, and more. Just think about it; for what may be the first time in your life, you can decide how much sleep you need and when. The joys of napping are a luxury that few working people can experience at will.