For dinner, experience the unique atmosphere of a themed café, such as a maid café or a cat café, where you can enjoy food and drinks while being entertained.
Find a themed café within Akihabara; they are all over the area.
End your day with a peaceful stroll at Shinjuku Gyoen National Garden, a beautiful park that showcases the tranquility of nature amidst the city's hustle.
Take the Chuo Line from Akihabara to Shinjuku Station, then walk to the garden.