Also at GCBC you get 4 beach towels in your room, 2 atop bed and 2 in closet and we were told just leave on floor for maid and they will be replaced meanwhile you already have another 2 to use. We had used one set for 2 days and maid came out to lanai and asked for our towels to replace them. I told her we try to conserve.
At Divi you must go to window at dive shop to get towels and they don't always have clean ones available.