Sympathisch:

“Sisters on the Fly® is the largest women’s social organization in the United States.

The friendships, the support among members & being together in the great outdoors are the beauty & benefits of Sisters on the Fly®. Camping, travel adventures, philanthropic endeavors, outdoor activities and social events together as women are at the heart & soul of SOTF. This membership-based community supports women in their journey to get up, get out, become more adventurous and have a more fulfilling life in the company of other like-minded friends.
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The one rule is ‘No men, no, kids, be nice & have fun.’ So leave it all behind in your rearview mirror.”