Shinjuku is probably one of the busiest areas, good for shopping and dining, and is usually where I stay since it's very central.

Here's a link to Japan Guide's page on Shinjuku. Shinjuku station is the busiest station in Tokyo, so it meets the bustling life criteria, Golden Gai and Omoide Yokocho have tons of small eateries if you want the street food experience. Sushi Miyako is in the Hyatt Regency Tokyo, or Sushi Iwase which has the highest tabelog rank in Shinjuku for sushi.

Unfortunately, most temples and shrines will be closed by 6pm, but you can still look from afar. Shinjuku Gyoen and Meiji Jingu are nearby, but Yoyogi park, which is close to Harajuku might be an alternative if you have enough time.

Shinjuku is probably one of the busiest areas, good for shopping and dining, and is usually where I stay since it's very central.

Here's a link to Japan Guide's page on Shinjuku. Shinjuku station is the busiest station in Tokyo, so it meets the bustling life criteria, Golden Gai and Omoide Yokocho have tons of small eateries if you want the street food experience. Sushi Miyako is in the Hyatt Regency Tokyo, or Sushi Iwase which has the highest tabelog rank in Shinjuku for sushi. I'd recommend using a concierge service, since it looks like the only way to reserve is by phone.

Unfortunately, most temples and shrines will be closed by 6pm, but you can still look from afar. Shinjuku Gyoen and Meiji Jingu are nearby, but Yoyogi park, which is close to Harajuku might be an alternative if you have enough time.