A double kickstand. 29ers tend to be on the heavy side. You'll want an Axiom rear rack that's compatible with disc brakes. You have your choice of plastic fenders made by SKS or Cascadia for 29ers and beware though that mounting very fat tires may not be possible with fenders.
The stock Continental Town Ride are good all around tires and if you want to go really big - Big Apples, Fat Franks and Big Bens will fit as will Continental's new Retro Ride.
Good luck.