Hello I am not a native speaker and I do not want to cause any confusion, but I think my advice can be useful for you: a) I'd like to take advantage of my stay here in participating- It gives different impression and you definitively want to say somehing else. I'd change that into- I'd like to benefit from my stay and participate in.... " as a guest I am not sure about the indefinite article before guest though, but I'd put it there.
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