Yes, I am back in one piece!
Kamakura is OK but Nikko is quite challenging and further away from Tokyo. I think you need 2 days for Nikko and best to find a place to stay there to really enjoy Nikko. Kind of rush if you need to travel to and fro for both days. For Subway, there is LED display in English to show which stations it is stopping but train it is strictly Japanese even with announcement.
Thank you again for the guide.
Hope you covered what you wanted for the trip
Yes, Nikko is a bit on the far side despite being about 2.5h away 'only'.
The last train being rather early (IIRC, its around 5pm) makes it more so.