Congratulations.
I've been retired for 2 years now and love it.
The hardest thing for some guys, and some gals too, is giving up something that for a lot of people has defined part of who they were for decades. I channeled a lot of that energy into doing projects, travelling and discovering new things.
i have a whole list of "Retirement Things to Do" and I haven't even scratched the surface on it yet.