I went a couple years ago, but not for a photo trip. I took a Ricoh GR1v and two 35mm rangefinders, 3 lenses (21, 28, and 50) and a selection of film. I think Portra 400, T-Max 400, and some T-Max P3200. Everything fit in a ThinkTank Photo Retro 5, which is a pretty small bag. If I went again, which I'd like to, I'd take the new Ricoh GR (digital camera) instead of the GR1v.
I had a lot of fun. It was a lovely place. With respect to my film choice, I went in November and thought a fast film would come in handy. I also I really like T-Max P3200, which is why I brought it. As for the Portra, while I'm usually mostly a B&W photographer, I think having color on a trip to a place you've never been can be nice sometimes. That's a roundabout way of saying I could have gotten by probably with just one 400 speed film.