Wales, according to the couple, was their "first home together" and will always be a special place for them.
The royals went to Wales to meet local communities and support mental health initiatives ahead of St. David's Day.
They started their day by going to the Brynawel Rehabilitation Centre, where a therapy garden is being built.
Kate wore a white polo neck, a cream coat, and a houndstooth skirt.
At a nearby recreation centre, students learned how exercise benefits mental health.
One of the most popular royal couples is the Prince and Princess of Wales.