I'm a nanny and need to do more activites with the 6 month old girl?

Ok so I am a nanny and I take care of a 6 month old baby girl. The mom just told me that I need to do more activites. We already go to the library 1x a week and a music class 1x a week, we talk a walk every morning. I'm and looking for things to do outside of the home or just outside in the grass. she loves pretty much everything