I ticked 'fetch' as our Nero is quite ball obsessed. He even ignores roos, rabbits or other dogs when I hold a ball in my hand. So we don't leave him a particular toy when we're out. He always has something to chew - mostly rawhide bones.
Kongs, puzzles etc. don't capture his attention very long but he likes squeaky toys. His absolute favourite is (so simple) a squeaking ball... I mean a BALL that SQUEAKS... WOHOO!! How good can it get?!!
If possible I take him for a long walk in the morning. When I don't have enough time I make sure to take the ball and let him chase it until his tongue hits the ground... then he sleeps most of the day cuddled up on our bed and stays out of trouble