Also, as a somewhat related aside: we went to Punta Cana Dominican Republic 3 years ago and stayed at the Iberostar. That was the first time I'd ever experienced chair "reserving" at a land resort. The vast majority of guests were European, particularly German, with only a few English speaking guests. Every morning starting as early as 6a.m., beach chairs and Palapas were staked out and reserved.
I assumed this was a uniquely European cultural thing, since I'd never seen it anywhere else, until the Carnval cruise.