Volunteer Opportunities in Seoul for a visiting American

Hello,

My partner will be in Seoul working for a month during the summer (June-July). We are contemplating having me (F, Mid 30s, American) come along, but I am wondering if there are things I can do to keep busy during the day while he is at work such as volunteer opportunities. I am not looking for paid work, as I know that is a whole different situation in terms of visa, but I was hoping to put my self to good use during my time there in some way. Does anyone have any insight?