I wish I had your problems :)
But actually as a "wanna-be" entrepreneur I am probably more qualified to answer your question since I probably spend more time than I should fantasizing about what I would do with my free time if I somehow managed to escape the black-holeish gravitational pull of a 9-5.
In terms of my own goals I would try becoming better at things that I currently don't have time to work on. And this of course is different for each individual. Personally, I'd paint :)
I would also share my knowledge with whoever was willing to listen. The skills and experience behind your success is something that I'm sure thousands of less-experienced entrepreneurs would kill to have access to. Invariably you will meet new people, hear new ideas, and this in itself should prove very satisfying. It might even give you that extra bit of inspiration you need to restart your own next big project.
In terms of my own goals I would try becoming better at things that I currently don't have time to work on. And this of course is different for each individual. Personally, I'd paint :)
I would also share my knowledge with whoever was willing to listen. The skills and experience behind your success is something that I'm sure thousands of less-experienced entrepreneurs would kill to have access to. Invariably you will meet new people, hear new ideas, and this in itself should prove very satisfying. It might even give you that extra bit of inspiration you need to restart your own next big project.