There is a small bus which you can catch to the garden and buy a day ticket to reach other attractions on the route. Only 500 ¥ for tourists. It is called My-Yu bus and the main office is just a short walk from the bus station where our cruise shuttle dropped us. You can catch the My-Yu bus back from another stop at the garden using an exit near the conservatory, so you don’t have to retrace your steps. The bus was very crowded, though - we stood there and back - and I think it also only goes about every 40 minutes. I don’t think there were any extra trips when the cruise was in, just the standard printed timetable from what we could see. So they aren’t really geared up for the numbers. If you are just going to the one place, I think a taxi would be more comfortable and more efficient. Probably arrange the return pickup as I didn’t see any taxis hanging around the exit the day we visited.

hi from memory it took about 15 minutes and cost around 2000 JPY each way.