Me, My wife, and two kids are looking to rent a car to travel from Portland,OR, to South Dakota and back. We will leave right after school gets out in June, and return 8 days later. We hope to be renting a full size car (Chevy Impala or Dodge Charger). Our finances are TIGHT. Does anyone know of any great deals or rebate codes? ALSO: is there anything sightseeing wise we should see while making this trip. Any info/advice is greatly appreciated!