The Girls Leadership Institute, co founded by Rachel Simmons, hosts various summer programs for girls. Here’s info from their website: http://www.girlsleadershipinstitute.org/
Overview GLI summer camp. This is the place where you can be real. At GLI, you live in a dorm with roommates and spend your days in fun self-discovery workshops, playing wild theatre games, sharing stories in small groups, making films, playing sports, and enjoying evening activities like extreme scavenger hunt or mask making. Every three days, there’s a field trip to a high ropes course, lakeside, or arts event. Girls come away from GLI with the confidence to be themselves and build lasting friendships. GLI helps you gain skills to face the challenges life throws your way.