Where do you take out your 3 month olds?

I've been a stay at home mom since she was born, my first baby. And I just usually stay at the house most of the time, only when I go to my mother, mother in laws, my sisters house, to the grocery store, baby store or appointments. I wish I could take my baby somewhere else, but I don't know what is an appropiate place for a 3 month old. Sometimes the weather is too hot, or too windy... where do you take your 3 month old???