Stay healthy. Get plenty of physical and mental exercise.
Keep your marriage happy and strong.
Spend time with your family. Hold them close. Celebrate at every chance.
Keep up with what's going on in technology and the rest of the world---don't turn into a grumpy old man who can barely work the TV remote.
Take care of small problems (of every kind) before they become big ones.
Take your time.
Be flexible.
Read up on managing income in retirement. Make sure you are invested at a risk-appropriate level for your age. Understand your investments, and don't get ripped off by management fees and loaded funds.
Make a spending plan (aka budget) and use it. Change as needed, but spend your money with purpose. (My guess is you've already been doing this, given your financial situation.)
And ENJOY YOURSELVES! Congratulations!