It really depends on how you want to hone your personal style and art. Too much complexity can often detract from a situation, but it just depends on the individual. Most of the fine art photographers that I admire use a single prime most of the time, but I'm into contemporary art more than travel photography, wedding photography, nature photography, etc, so YMMV.
The way I look at it, no matter where one stands in the world, there are a million photographic opportunities with any lens that you can think of. You could stand in one place and shoot macros, wide landscapes, narrower landscapes, tele shots of a bird, abstracts, etc. all day without moving, but, to me, limiting myself helps develop a direction and vision.
I generally only bring a 50mm lens, and, when I do bring a 28 and 90, I only use those in rare, necessary circumstances, which, honestly, don't come up that often. I'm certainly no HCB, but he usually carried a 35, 50 and 90, and you'd be hard pressed to find more than a handful of shots from him at anything other than 50mm, but, again, it just depends on what type of photography that you want to create.
Bringing one lens, bringing 20 lenses, or bringing something in between all works well for different people. Granted, gooomz, since you're not sure, I'd recommend starting simple, first.