Noel, forgive me,but what is a SPH room? (I know, newbie question!!

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I can't wait til Sunday night at midnight.. when we can book our shore excursions.. Even though we are only booking one - LOL the fishing on CC for DH.. Oh, and we are doing the stingray thing on CC too.. and mabye other stuff there too..
Question for you -- when we book shore excursions, does that cost immediately go on to our onboard account? I am just trying to figure how they are going to charge us for excursions.. Do they just get added to the "tab"?
I think i am going to select the "Cash" option for taking care of my bill (onboard acct.), simply to help me keep track of my expenses better. It will all be coming off my debit card, so i want to make sure i don't go nuts. And they said they charge your card whenever you get to $400.. But, we also have a $200 OBC. Which should take care of most/if not all of our excursions.