I'm going to Japan in 2 weeks. 1st time. I have a few questions.

I'm going with my father who cannot walk long distances. Is it better to take a taxi from hotel directly to Meiji Shrine or can I get a taxi at the Harajuku station? I heard the walk from the station is 20 minutes to the shrine so it would be about 1 mile which is quite a distance for him

The Tsukiji Fish Markets starts registration for the tuna auction at 5 AM. How early do I need to be there to insure that I am one of the 120 people allowed in, 4 AM? How much time via Taxi from Keio Plaza in Shinjuku?

Lastly, is it better to take a tour in Kyoto or are most the attractions, Nijo Castle, Kiyomizu Temple, Kinakakuji Temple, Sanjusangendo Temple, easily accessible by taxi. I will have 1 1/2 days.