Definitely let them know ahead of time that you are celebrating your honeymoon! Even if they simply offer a sincere, "Congratulations", it's a good idea to let them know you're celebrating. I think the staff likes to know these things ahead of time - many places enjoy offering some sort of nice gesture like a note, bottle of wine, or something small like that.

I suggest to also look into any other special packages they may offer, as the PP suggested! I did look it up, and they don't have a club level (darn). They do have a honeymoon package - but it may be cheaper to just book your room and add on what you like (I don't know the exchange rate, and did look their packages up but have no idea what the prices are!).

Also, read reviews where you can find them (tripadvisor, oyster, etc...) to familiarize yourself with the property and what it offers!

Wishing you the best!