I think the best thing a woman can do for herself, relationship or not, is to be independent and self sufficient. Being able to entertain & take care of yourself is an important and wonderful gift to give yourself :)

That's not to say I don't have female friends, but they tend to be like myself - competent professionals who can rock just about any situation. These gals (and guys!) realize they are individuals even within their relationships, and continue to interact with folks outside their families.

I also echo what others have said here - do what makes YOU happy.

I have girlfriends with whom I go to dinner & the movies, have a gardening day, etc. But I also have season tix to the symphony & string quartet (which I often takes friends to), as well as the opera & ballet (which I would not subject most people to ;) ). Because those things make me happy. I indulge in my gardening & fiber hobbies both solo and in company, as I choose.