Enjoy your retirement!! I have been retired almost 8 years now and am loving every minute of it!! Take some time to explore what you want to do. I had so many things I wanted to do that i overcommitted myself the first year---mainly with community volunteer activities. Eventually I got better at saying "no" and pared it down to a schedule I enjoy without overdoing it. Allow yourself to enjoy "piddling" as I call it---sitting in my Jammie's at 10am reading the paper is OK!!! Keep up some socializing with friends, don't let yourself get isolated and lonely. My husband never made the effort to make guy friends and rarely leaves the house. I have made lots of suggestions of things for him to do, but he seems to prefer staying home, but I also think he gets lonely especially when I travel. I don't think that is particularly healthy.
Also get a good handle on your finances and get comfortable with responsibly drawing down and living on your retirement income and savings. We worked hard and always had the "save" mentality---it was harder than I thought to get comfortable with spending savings now. Also, if you haven't already, get all your affairs in order---wills, advance medical directives, power of attorney, etc---you never know when the need for those will arise.
Have fun!!!