We went to Mr Sanchoz three times last year. Gabriella always made sure my frozen marg were perfect. We have not done Chak Park because my youngest son loves to play in the waves and since the Park has the protected lagoon (which is best for snorkeling)...they don't get the waves that the regular beaches do. A froz marg runs about $4.50 each (and don't freak when the bill says 45.00...remember that is pecos) Bean and cheese nachos around 5.50 as best as I can remember. October we ran into a problem with flies...but that would have been at any section of the beach. January and July we had no problems with them.
We have not been to Paradise...so I can't comment on them. Sanchoz does have restrooms, showers, lockers, table and chairs under a thatched umbrella (which I love) or the lounge chairs...all for free. All they expect you to do is drink or eat, of course. But there is no minimum. There is a charge for the water trampolines. Jet skis are near by and there are always folks coming around wanting to take you snorkeling off shore...since the waves prevent snorkeling near the shore from being very productive.
Also there are ATVS, horseback riding etc which we have never done there...but it is available.