On Banyan Drive, right next to the Hilo Hawaiian Hotel, there is a quanit Japanese garden, dedicated to Queen Lili'uokalani, who loved gardens. This offered a nice, short stroll from the hotel (about all I could stand in my condition). Unfortunately for us, it had rained more than usual, and much of the park was washed out, not allowing us to visit the area with cute Japanese bridges and statuary.
The Japanese Garden in Hilo was very pretty, had all the usual trees, plants, water features, and bridges, that a garden of this type should have, but I felt it was just a little empty looking. I love Japanese Gardens, and have seen quite a few. With a little more work, this one has the potential to be one of the great ones.
This park is surely a pleasant experience and a nice place to wind down if you have been on a busy traveling schedule.