The Gifu castle is relatively small, and as most of the castles in Japan is a museum inside, i.e., there's an exhibition of old goods, clothes, arming and weapons inside. Getting to the top, you'll be able to enjoy a great view of the entire Gifu city.
WiFi: there is free wifi in Gifu Castle (so, tourists can live stream their experience).
There are two ways to get to the castle: hike or take a ropeway. After getting uphill, you'll be able to look around before you get to the castle itself (will need to walk a bit).
There's also a restaurant on the hill (close to the castle) with an open-air terrace that offers dinners for those who love having dinner with a view. The restaurant opens at around 6 pm. You can watch amazing sunsets if staying there until the sun goes down. But should keep in mind that the restaurant is open during summertime only and closes at the end of August.More