I was also a manager before I retired. There are some good ideas above (some of which I used, like the countdown calendar, list of things I would be doing when I retired, etc).
Additionally, I thought in terms of quarters....I had 4 quarters left. Before I knew it, I had 3 quarters.... Don't know if your company works that way or not....but I found when I hit the 1 year mark, we were oftentimes talking about stuff that I wouldn't be around for (ie next year's budget, this new system....). That helped (me) a lot, because at that point I could ignore it or give my honest opinion realizing it didn't really matter if they listened to me or not.
Also, it may feel good to save your vacation time to get paid for it all when you retire, but you will always get paid for it. It just depends on when you want (or need) that "payment". Consider using some of it to go into early retirement mode now. Four day work weeks can be a nice thing.
A friend asked me why I was using so much of my vacation before I retired.
Friend: "Don't you get paid for it?"
My response: "Of course, but I want to get paid for it now......to stay home....now".
The way I looked at it, I was "retired" and making a little extra money by going into work part-time to help out the other days. Improved my outlook considerably.
Disclaimer - I didn't start using my extra vacation time until I was in my last quarter.