[mindcrime]

I mean... is he retiring or just "changing jobs?" If he's retiring, I'd say what he can do includes:

Go fishing

Take up photography

Take up a musical instrument

Learn a foreign language

Travel

Go camping

Volunteer for a cause that's near and dear to his heart

Read

Attend live music performances

Go fishing

Go to museums

Restore an old car (or tractor, or bicycle, or radio, or $WHATEVER)

Build a Tesla coil

Go fishing

etc...