If the cabanas are all booked up is there anyway to find out if there’s cancellations same day to rent a cabana

U can get put on a waiting list and the park staff should contact. You have to rsvp the day before so if someone cancels they'll give u a ring to let u know ahead of time usually.

I just took over a spot and nobody noticed. There isn't enough staff on hand to enforce it too heavily

I had no luck trying to talk to a live person before we went so best thing would be is to go early and see what they might have.

I am sorry I don't know but you can call and ask

There's some customer service tables where you can ask employees.