Definitely a must-visit experience in Hakodate especially during cherry blossom blooms or in the fall. We went in the last week of April and the cherry blossoms were in full bloom and it looked absolutely gorgeous!!
There is also an observation deck near the entrance (Goryokaku tower) and I would recommend going up to get a great view of the fort as well as the surrounding city.
Would also recommend staying till after dark as they light up the space with lanterns.
For me this is probably the best place to experience cherry blossoms during spring in Japan. The density of the cherry blossoms and how they're arranged in the park is just amazing and makes for so many amazing shots and videos. It's an awesome experience to see the cherry blossoms bloom here
The historical archaeological site is conveniently located just a few minutes' walk from the hotel, making it easily accessible for guests. It offers a fascinating glimpse into the past, adding a cultural dimension to your visit to Hokodate