Congratulations Dave. Hats off to you for a long career and such a positive mind on the future.
I semi-retired at 48 three years ago(not through ill health mind). A little like CJB, bored to tears. So found a hobby, and also doing voluntary work and a little consultancy when asked. It's getting the balance right I guess between having enough free time (good = more than when working full time) and not too much free time that your mind finds things to worry about!!
Enjoy yourself Dave...you sound as though you already have it all planned which in my view, was the right thing to do. Good on you.