Yes, there are three. From my perspective, these are “cabana light” rather than a true cabana like you see at some other resorts. No amenities, it’s just shade/shelter/seating. Pricing varies by the season and I’m blanking on the #s right now, maybe someone else who has done it recently can remember.
You can book the whole day or half day. Whole day is 10am-7pm. Half day is 10am-2pm or 3pm-7pm.
“Worth” is subjective of course, but it can be nice to have a secured spot and some shade. IMHO the price is pretty reasonable for what you get.
I will say, my kids prefer to be at the Lava Pool so even when we had one, we spent half our time over there... so probably not really “worth” it for the way we ended up utilizing it!
Here are some pics in case helpful:
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