If you don't mind four in a bed 10 is fine
I assume you mean the cabanas at the Grand Californian and Disneyland hotel, if so it's $299. It is a maximum of 6 guests.
I suggest you to tent an Airbnb, is better and cheaper
I think you and whomever you bring have to be staying at the Resort to rent one. I've used the pool a few times but never rented a cabana.
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