Agree with those who recommended the Beachfront Suites and Bldgs A and B. However, the first time we went to CSS we stayed in Section D and it was lovely. Right over the ocean from our Veranda and about halfway between the beach and the upper buildings so really not so many stairs. I agree that you should not rent a car. You can book excursions from the resort which will include transportation and of course Dunns River Falls is included at no additional charge. We love CSS. In 2018 we're doing a split stay between CSS and CN. Can't wait. You should join Romance Rewards before you go, if you haven't already. Then you could request a block. There is no guarantee but we've always gotten what we requested in the 7 times we've been.
Sally