My wife and I found that when it’s no longer really about the money anymore, you discover there are many great ways to spend your time. The obvious activities come to mind–more travel, more time at the beach, golf, tennis, boating–etc., etc.
In addition, for us, a lot revolves around the kids and the family, as well as maintaining our rental properties and our involvement in the film business.
It’s a time when you are free to “follow your bliss,” whatever that may be. Once you find that, you’ll be busy for the rest of your life.