Umbrella will allow you to stay and listen to the relaxing rain drops hitting the trees! I love it!
You can easily find your way back to the main building in a short amount of time if you are that concerned about getting wet. As another guide said, the gardens are not huge. There are plenty of opportunities to exit back to the building.
I wouldn't recommend going on a rainy day.
There is a lot of tree cover on the paths. There is a covered amphitheater that could be used for shelter during the rain. The gardens are not huge overall, just lots of winding paths.
There are shelters available. But, carry an umbrella as they mainly help for hot sun :-)
Not covered...
Not all walkways are covered. There are a few covered areas
Is recommended to carry a raincoat.
Take an Umbrella
It is easy enough to get to a covered area or back to the main building, besides a little rain never hurt anybody... might cool things off a bit.
Thanks! Your answer is awaiting moderation.