I have a group of girlfriends that I call my Goddess posse. There are 6 of us and we've known each other for over 40 years. We do at least 2 girls day out every year and it's always the best time.
We usually do shopping and a long lunch. It is the kind of friendships that make you feel like your batteries are recharged just by hanging together for a day.
I see them more than that but it's for other functions not a girls day out kind of thing. They all have children.