Hey! I happen to be crew president of an all-female crew. We've been going strong for two years.
As far as high adventure goes, I believe the poster above pretty much hit it dead on.
One of my best memories of a crew adventure was a week in west Texas, hanging out on the Frio river and taking VLSC, taught by our crew advisers.
My crew does a lot of stuff outside of camping trips and high adventure. This is by absolute no means how the program needs to be run, but Venturing as a program is so loose anyway, you can get away with pretty much anything. If the girls want to do something, then encourage them to find a way to do it. The program, in essence, is youth-led, to help these girls learn how to lead, make decisions, plan, etc.
As a suggestion, keep a roster. And don't underestimate the power of Facebook. An all-female crew. About a dozen plus some teenage girls. What's the one thing (besides their cellphones) that they check more than once a day? If you can start a crew Facebook group, you can send out mass bulletins very quickly and easily.
We meet the first Sunday of every month at one of the crew member's houses to have a planning meeting. We eat dinner, sometimes play a board game, watch old 80's movies, you know. Later on in the month, we have something to do. Be it an overnight campout, a Cub-o-ree to staff (a female presence at boy scout camps is ALWAYS welcome.), or something a little more unorthodox. Many of our girls are artists, so one night, as a crew, we went to see a travelling French Impressionists exhibit.
It is great that there are more all-female crews out there. Share the love. I wish you the best of luck.