I’d like to visit Kamikochi but are only in the area until 20 April, with the official opening not until 27th April this year. I believe that the buses start running a week prior to the official opening. If we visit before to the official opening what can we find open?. Thanks for any advice.
The Kamikochi line bus will begin running on April 17th, 2018. You can access Kamikochi from then and see all parts of the valley, but none of the facilities will be open (restaurants, hotels, etc.). If you want to visit at that time, please be sure to bring food and water with you when you go (and please take all of your trash home when you leave).
You can see the bus timetable here. There may be a few slight changes to the schedule before April, so please check it again in advance of your trip.