I'm going to disagree with some of the comments above.
Firstly, there is actually a fairly decent range of tones in your picture. They are somewhat compressed, and can be brought out with judicious processing. You have dark shadows and bright highlights, with a lot of different tones in between.
Secondly, a good black and white image doesn't necessarily have to have a full range of tones in order to be successful. Sometimes the subject suits high key or low key treatment, sometimes a limited palette of tones emphasises the graphical nature of the subject and sometimes the subject is just more important than the exposure errors (but not that often).
There are generally 4 types of photo, in respect of colour/B+W:
1. It only works in colour.
2. It works both in colour and black and white.
3. It only works in black and white.
4. It doesn't work at all.
You have to assess whether a picture will fall into one of the categories. For a good black and white image, generally you have to have something that is independent of colour: ie a strong graphical element, shapes, faces, architecture, lines etc and/ or good contrast. Here we find the comments above, about different colours looking similar tones in black and white. Reds and greens, for instance. We have to change the filtration in order to make the colours stand out from each other in black and white - using channel mixer for instance, or PS's more advanced black and white adjustment tools. A colour will lighten itself more (in B+W) the stronger the filter effect is, and darken the opposite colours. So a red filter will darken a sky, and lighten skin tones, red brick etc, whereas a green filter will lighten foliage but slightly darken skin. A basic knowledge of the colour wheel is required, to know what the effects of a particular filter will be, then you can use that filtration to adjust how tonal values appear in the picture: ie to create "tonal separation."
Unfortunately, this is a picture in category 4. As mentioned, there is no real subject, the trees are bland, the boat intrusive, it looks like you have a dirty lens as there is evidence of flare, and it isn't very sharp. It doesn't translate well to black and white, so you are really on a loser from the outset.
There are too many members on here who think a picture will look better in black and white because it is more "arty", whereas in reality, you really need to have black and white in mind at the shooting stage, and find a subject that suits it. Trying black and white because a picture is bland in colour rarely works.
This picture doesn't do well in black and white because, apart from the boat section, the rest of the frame is very similar in tone, so nothing stands out as an obvious subject. If you want good black and white, to start with, look for contrasts in tone, easily definable shapes and pictures with a definite and obvious subject.