Bring back Marion or Mutt.
Have too many sidekicks along for the journey.
Have Indy taking a back seat in some of the main action scenes.
Make jokes about age.
Be afraid of letting Indy use his gun.
Get back to basics of an Indy adventure with preferrably just one or two sidekicks.
Have a menacing villain.
Get back to the scope of previous films by using real locations around the world.