As a guide leader for over 25 years, can I point out that guides (plus rainbows, brownies and senior section, aged from 5 to 25 as well as adult leaders) do everything that boys can do in beavers, cubs ,scouts ect.
We get outdoors, camp, do backwoods cooking, absail, climb, go canoeing, hike, geocache, play sports you name it, we do it! About the only thing we don't do is shoot at person shaped targets, although rifle shooting or archery using targets is fine (and popular in out group). We also do what you may think of as more "girly" activities: cooking, in fact anything to do with food, is always popular, crafts, (they all seem to hate sewing though), Bollywood dancing went down a storm.
We are "girl led" in that the girls have a big part in planning what they want to do, and as leaders we suggest things they might not have thought of.
Men can be unit helpers, not leaders. All leaders are female. We are all police checked btw.
At a camp, or indoor residential, leaders do not share sleeping quarters with girls and have desperate toilets and showers where ever possible.
When asked, and there have been many surveys over the years, girls have overwhelming said they prefer to have the safe girl only space guiding offers.
I hope this clears up any misconceptions!
As for trans girls, I would hope that should the situation arise, we could deal with it in a,sympathetic manner.