I view retirement mostly as financial freedom. I have every intention of working after retirement as I get personal enjoyment out of doing what I do. I just haven't decided what "work" will look like.
The only reason I ever get bored is because I don't have the time, resources, and/or other people to do what I want. The thought of not having to rely on a work schedule to provide necessary resources sounds wonderful, not threatening.
The last couple of vacations I've taken have been staycations. Even though I have many hobbies and interests - several musical instruments, writing music, drawing, dabbling in code, reading - not having the structure of a job and expectations of others weighing on me to 'be productive' I procrastinated quite a lot. I frequently felt anxious and unfulfilled. I took this experience as a glimpse into what retirement might be like.
In retirement I think I'll need to create a schedule for myself that includes having others depending on me to 'show up'. E.g. doing volunteer teaching, etc.
Last year I was unemployed for about a month, and it was really only near the end of that time that I started to get some momentum going with side projects and hobbies.
I know that's probably different than your staycations, but it's for that reason that I don't think I will be as bad at working on my personal projects once I've retired (if I ever can retire).
So it's easy for me to be engaged, hard for me to complete anything.
It sounds like you're saying that you want to continue existing and being able to do things after you retire... That is exactly what retirement is. Why do you feel like you need to sound like one of those "go-getting", "I'm-always-working" people who thinks everyone should work 22 hours a day?
And yes, I am a "go getter". :)