Maciej P.
Google
We went here by ropeway (where at the ground station, you can buy a coin for it and observatory) just before the sun set (around 15 minutes, sun was already just above the horizon), so some of the best spots were taken. Though most people were interested in the other side which is the Nagasaki city by night, which at first we didn't understand. The views from both sides are quite remarkable and different. On one side you have an ocean and wild nature, green hills etc. on the other there is a bustling city. Since it's a tower on a mountain top it can be quite chilly and windy, though since it's also quite popular you have a natural wind shield most of the time. Some people wrote that you should be here and hour earlier, so maybe we were lucky but we got the photos from the first line without problems.
If you come by car there is a free parking next to the cable car station, though you can also drive up, however the parking next to the observatory on the mountain top was closed when we were there. If you come by ropeway or slope car there is an additional attraction of the blue bridge in the tree tops. The observatory is free, so only parking/ropeway cost 1250 round way ( and offers additional views of the city)