Kyoto Imperial Palace no longer requires advance reservations and admission is free. If you want to join an official guided tour, you just need to gather at the visitors' lounge at the designated time. Bags are inspected before entry, and overall security is quite strict.
The palace itself is actually not as ornate as you might imagine. If you're expecting a lavish palace, Nijo Castle may be closer to what you have in mind. What really matters about Kyoto Imperial Palace is its buildings, such as the Shishinden and Seiryoden, and its history as the longtime residence of the emperor and a venue for important ceremonies. Inside the Shishinden are the Takamikura throne used for enthronement ceremonies and the Michodai throne for the empress. In front of the hall are the iconic Sakon cherry tree and Ukon tachibana tree, though visitors are kept at a distance and can only view them from outside.
What I found most interesting about Kyoto Imperial Palace was the layout of the space itself and its sense of history. Some of the sliding doors and wall paintings are also very intricate. However, if you're simply comparing architectural details or gardens, Kyoto has quite a few places with more to see. For gardens, I would recommend Katsura Imperial Villa more.
If you want to experience buildings related to the imperial family up close, I would actually highly recommend Daikakuji Temple near Arashiyama. It was formerly the Saga Imperial Palace and also has buildings relocated from Kyoto Imperial Palace, and you can view them from much closer than at Kyoto Imperial Palace.
Overall, what makes Kyoto Imperial Palace special is its historical significance rather than its splendor. If you're already interested in Japan's imperial family, court system, or traditional architecture, it's still worth a visit.
