I think the "main" pools at the resorts provide towels, but not necessary the smaller pools.
I stayed at POR last October, and the smaller "quiet" pool by my room didn't have towels. I brought one from my room. But the "big" pool did provide towels.
If you want the larger size I would bring them, but if you don't care that they are shower sized then I wouldn't worry. We used the ones at the hotel and it worked fine and saved some room in our suitcases. Have a great trip!
The value resorts do not provide towels at the pools. However you should just bring towels from your room and then you call mousekeeping before you leave for the pool - they will fresh towels for you right away!
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