The "cheapest" rooms at Sandals GRANDE in general are not on the riviera side, but across the road on the manor side. They are the mountain view rooms in the great house (manor). The cheapest rooms on the riviera side are the deluxe grove rooms and they are not ocean view, in fact they are the first buildings outside of the lobby to the right. I have booked these rooms each time, but fortunately always got an upgrade to either the ocean view cottage outside of the Reef Terrace, or in the Riviera building, so I've actually never been inside a deluxe grove room!! lol
I think most of the rooms at sandals are now tiled floors with area rugs, however we've had two rooms in the riviera building which were carpeted. If your friends paid the cheapest price but are SSG members, they will be entitled to an upgrade, so be sure to remind them of that.
Regardless of which "side" they're on, the shuttles run constantly almost 24 hours a day, so it's not that big of a deal, really.