How exciting! I hear Tokyo has some great walls! …But I’m going to assume you might want to move beyond just walls. The grounds of the Tokyo Imperial Palace are beautiful and a perfect place for a stroll. The Meiji Shrine is a great option if you are interested in seeing a Shinto shrine. If you are also interested in seeing a Buddhist temple, visit Zōjō-ji, which has buildings dating to the 1600’s. If you’re a sushi lover, you might want to check out the Tsukiji fish market before it is relocated in the fall of 2018. If you like unique and fascinating museums, check out the Ghibli Museum, the Sumo Museum, or the Meguro Parasitological Museum as well! Have a great trip!