I have been in Japan for years and have planned to visit Nagasaki many times and it just didn’t happen. I finally made it happen earlier this year. It was worth the trek from Tokyo.
Nagasaki Atomic Bomb Museum – https://nagasakipeace.jp/english/abm.html is a good place to spend a few hours learning about the tragedy that befell the city.
Nagasaki Peace Park is also a place to explore and learn more about the bombing and it’s focus on promoting peace.
Getting around the city is easy since there is a tram that passes by its many sights. Unfortunately, you have to pay with cash or buy the local IC card. It doesn’t take Suica or Pasmo.
I recommend spending at least two days there to explore all its wonders. There are many historical churches there.
There is also a museum to remember the Catholics who were killed for their faith there. The Twenty Six Martyrs Museum is very educational.
Read more here to know how to enjoy your trip to Nagasaki – https://www.keirinkai.or.jp/nagasaki-walks/sights/points_of_interest.html
The quickest way to get to Nagasaki is to fly there. It can be pricey at times but if booked ahead deals can be had. It takes way too long to go their by shinkansen. Another cost effect way to get there is to fly to Fukuoka and then go to Nagasaki by train from there.
Nagasaki is unique and a Japanese city like no other because of its history as a port city. It had a range of foreign influences and this is present in its sites and foods.
I am glad I finally got the chance to visit.