You didn't say anything about what kind of shooting you'll be doing, with a DSLR or point and shoot, or space limitations, so while a monopod may be easier to carry and "good enough" for snapshots, it's not as good as a tripod. A monopod won't allow you to shoot sharp photos any time a slower shutter is needed such as during early morning or evening when light is low and you need to use a small aperture, which happen to be pretty common conditions for making landscape photos.
I'm assuming by snapshots you mean photos with quick shutter speeds, and not poor photographs being that high-end professionals use monopods. And unless you are shooting 2 second exposures and higher, a monopod is more than enough.
You didn't say anything about what kind of shooting you'll be doing, with a DSLR or point and shoot, or space limitations, so while a monopod may be easier to carry and "good enough" for snapshots, it's not as good as a tripod. A monopod won't allow you to shoot sharp photos any time a slower shutter is needed such as during early morning or evening when light is low and you need to use a small aperture, which happen to be pretty common conditions for making landscape photos.
I'm assuming by snapshots you mean photos with quick shutter speeds, and not poor photographs being that high-end professionals use monopods. And unless you are shooting 2 second exposures and higher, a monopod is more than enough.
Some pros might use monopods when a high shutter speed is possible, but a monopod is not sufficient to steady a camera anywhere near 2 seconds.