If you and your girlfriends share an interest in golf or yoga, take a trip together that revolves around your favorite activity. Consider a location that looks interesting, meets everyone's budget and is accessible to all.
For example, are you into meditation? Research ashrams or meditation retreats where you can learn and practice. Choosing a girls' getaway based on an activity can be a wonderful way to focus a trip (everyone knows what to expect), burn calories, improve your skills or meet other people who dig that hobby as much as you.
If you opt for a group activity, it's best to take this kind of trip with women whose skill levels are all about the same. Seasoned golfers won't want to hit the greens with a novice who doesn't know the rules or who plays the game at a slower pace.