Okay, when I'm feeling like that, I like something well paced and unusual, and maybe something I haven't heard much about, so here's a suggestion that I think fits: Ammonite by Nicola Griffith. Here's what I wrote in my notes/mini review:

A planet has been discovered that has the remnants of a ship that landed there a couple hundred years prior. The powerful earth-based corporation that controls many things and is just called The Company had previously sent a ship of military and teachers down, but a virus killed all of the men and some of the women, so the remnants are quarantined. Into this, an anthropologist goes down, being paid to test a new vaccine, but personally wanting to study the completely female culture, and find out how they've continued to have kids for 200 years. I really enjoyed this book. It's interesting that I didn't find myself thinking about gender roles at all in a book where every character is female. I didn't think of it as a lesbian novel, even though there are love stories within it. It's just a story about cultures and people, some finding their way in new situations.