The Shinetsu Kougen is a beautiful area in Japan, however it's a bit far from all the major international airports. When planning your trip, you should plan to take at least 3 hours to get from the airport to Iiyama train station.
After landing in Narita Airport (or Haneda Airport), take a bus or train into Tokyo (approximately 1 hour). From Tokyo, take a high speed Shinkansen (bullet train) to Iiyama station (approximately 1 hour 40 minutes).
You can purchase JR train tickets at stations.
Please see instructions written in English on this website.
From Narita Airport to Madarao Kougen
From Myoko Kougen to Narita Airport
NOTE: Reservations required to use the race shuttle buses