You're asking the question that is niggling on your mind because you already feel the answer: yes, there is too much sand so the horizon is dead centre. Especially in landscape photography this often is something that should be avoided (there are exception to the rules in photography as anywhere else!). This, however, so you feel (I`m sure!) and I do, is no such exception, but a photo that wants the horizon either on the line that borders the top of the bottom third of the frame (less sand), or - depending on what is more important to you), the bottom of the top third.
Do I express myself here at all!??!? Argh. I`m no longer sure.