Вам нужно подсчитать примерную стоимость ваших затрат и тогда решать, брать JR pass или нет.
По поводу использования Suica или других транспортных карт для проезда в синкансенах, вы не можете их использовать, если коротко, но лучше почитать здесь
https://www.-/e/e2359_003.htmlShinkansen
Until relatively recently, shinkansen trains could not be used with regular IC cards; however, the situation has started to change:
On the Tokaido-Sanyo Shinkansen
It is now possible to use IC cards, including Suica, Pasmo and Icoca, on the Tokaido-Sanyo Shinkansen. In order to do so, an IC card and a credit card have to be registered on an English app or a Japanese website. Afterwards, it is possible to purchase shinkansen tickets online and use the registered IC card to pass through the shinkansen ticket gates. Fares are discounted by 200 yen when using this service and are charged to the registered credit card rather than subtracted from the IC card's balance. Unfortunately, the English app is currently available only in Australia, Canada, Hong Kong, Malaysia, Singapore, Taiwan, Thailand and the United States, but there are plans to make the service available worldwide around March 2020 through a website. Note also that Japan Rail Pass users cannot use this system to make seat reservations.
On the Tohoku/Joetsu/Hokuriku Shinkansen near Tokyo
In April 2018, it became possible to use regular IC cards, including Suica, Pasmo and Icoca, on non-reserved seats of shinkansen trains between Tokyo and as far as Nasu-Shiobara on the Tohoku Shinkansen, Jomo Kogen on the Joetsu Shinkansen and Annaka Haruna on the Hokuriku Shinkansen. Before you can use an IC card on these shinkansen trains, the card has to be registered at a ticket machine for this service, which is known as the "Touch de Go" service. Fares will be subtracted from the IC card's balance.
On other shinkansen trains
Regular IC cards can generally not be used on shinkansen trains other than the ones mentioned above. The "Mobile Suica" app can be used on mobile phones to ride the shinkansen in eastern and northern Japan; however, the app is only available in Japanese and on phones that support the Osaifu Keitai functionality. From March 14, 2020, it will become possible to use regular IC cards on all shinkansen trains in eastern and northern Japan by purchasing e-tickets through the Ekinet website; however, the website is only available in Japanese.
Я за право народов решать свою судьбу самостоятельно, без вторжений извне, и за суверенитет каждой страны