Do things you love with people you love.
If you have kids, go be with them. Travel, see the world.
Philanthropy.
Start another business if you feel the urge. Meet people. Get into the arts (the founder of my present company, OVH, used his fortune to buy a bunch of guitars and become a performing musician, Ken Block used his DC money to get into car racing)...
A creative soul like Woz will always find something worth doing :)