First of all, it's great that you took your parents to the place where your mother lived during her childhood. I can imagine how happy she felt while spending valuable time there again. I think it's a very excellent gift for her indeed!
The islands are very beautiful with wonderful scenery of the lake and the mountains. The botanical park is fascinating with gorgeous flowers and wonderful plants. The palace is magnificent and the garden is beautiful.
I'm glad to know that the COVID-19 situation in Italy is largely under control, for now.
Thanks so much for sharing. Stay safe and healthy! ;)