I visited in mid-April. It's just one small pond and that’s it. There are some koi fish swimming around, but the colors aren't as vibrant as I expected. I feel like the promotional photos were heavily edited to look much better than the reality.
If you try to come here after seeing videos online you will be very disappointed. The pond is very dull looking and greenish, can hardly see any fish and there was a weird smell when we went there in March. I'm not sure if the look of the pond or smell is gone at other times during the year but I wasn't too impressed.
The pond is small but beautiful, especially at the spot where the carp swim by and you can see the quartz sand at the bottom.
On a sunny day, the fish swimming gracefully with their shadows in the water looks almost magical. It was nice to learn that the pond is fed by natural spring water.
We visited on a Saturday in mid July, and it was crowded and hot.
The free parking opposite the road was full, so we park at a nearer paid parking cost 500 yen, and we were given an uchiwa with the pond’s illustration, which was a nice touch.
No need to make a special trip just for this, but it was a pleasant stop as we were on our way to Gujo Hachiman.
The actual size of the pond is not that large as imagined. But it’s cute and we could still take nice photos. But it is suggested to visit in summer. There is not much to see in winter time. No lotus. A few fishes only. I am sure it will be much better in summer time.
I have been to Monet's Pond several times now. The pond, although small, is spectacular in the right conditions. On cloudy days it's not quite so beautiful, nor early in the morning when the sun is still blocked by the mountains. The peak for beauty seems to be in the afternoon when the sunlight reaches the pond. The biggest drawback with the pond is the number of people. It's not uncommon for there to be people shoulder to shoulder all the way around the pond on weekends. However, if you get there before 10AM it's not as crowded. Across the road is a parking lot (500yen) and a river. The river is also quite beautiful and photo worthy. Behind the pond there's a hydrangea park about a 5 to 10 minute hike into the woods. Over all it's a great place to visit.