UV filters were useful from an optical standpoint on film, that is not true on digital so there is no optical reason to use one. If you feel the need to protect the front element of the lens from spray, sand, hard knocks, flying seagull dodo or whatever that is your call. Just understand that putting on any filters will decrease the image quality to some degree. Whether it decreases it enough to bother you, only you can say. The lens hood on the other hand will always improve the image quality and provides protection as well, perhaps not quite the same as a filter but more effective in some ways, less in others.
A circular polarizer filter on the other hand can make dramatic differences in your photos by eliminating some of the glare and reflections off the water. I do not use one all the time but it is the only filter that is always in my bag, in some situations it makes the shot. Be aware that at the wide end of your lens a CPL can cause uneven colors in the sky, this is due to the width of the angle of view of the lens covering more of the sky, not the CPL. The difference is already in your shots, but without the CPL it is usually not very noticeable.
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