Good for you!!! One thing to watch for... when you retire, some friends & family think, "Oh good! Now that Irv is retired, he has plenty of time, so he can do...". It's easy to get pushed into doing stuff you really don't want to do. I'm completely convinced that is the reason why a lot of retired people tell you, "My calendar stays full and I am so busy".
So my suggestion, whenever someone asks how you like retirement, you say, "Great, but my calendar stays full and I am busier now than when I was working". It sets the stage for a graceful decline of some request later.