When I had about a dozen women I had a meeting -- involving a lot of wine and appetizers -- and proposed that we pick four adventures for the year. I told everyone that participation wasn't a requirement. Every activity should be an opportunity not an obligation so there shouldn't be any stress. We all agreed that we would limit the group to women -- no kids, no husbands, no significant others.
That was years ago and these days the League of Adventurous Women has more than 50 members representing a variety of ages and backgrounds. We have single 30-somethings and grandmothers, research scientists, teachers, federal workers and stay-at-home moms. Friends invite friends, I still invite women that I meet along the way. I keep a master list of adventures but I don't limit our adventure list in any way. An adventure to one woman may be ordinary or scary to another so it's good to have a variety of choices. I do keep all of the suggestions anonymous (I'll never tell who wants to learn pole dancing!).
FYI, some of the women who told me they were too old are now the ones who lead the most adventurous trips.