Besides the cabanas are there other shady areas that you can sit or have other chairs available...?

Can you bring a fridge with food?

Yes there are several lounge chairs available that provide umbrellas as well as picnic benches with umbrellas. All are "FIRST COME FIRST SERVE" plan accordingly.

there's alot of chairs with umbrellas, but... get there early u might get a good spot.. not everywhere has shade