do you have to pay for the sunbeds?

No

All good plenty of beds all over the park

No but cabanas and premium seats you pay for. If you get there early there are plenty of Seat options.

No, you pay to get in by pass or ticket but the best areas do get taken up quickly. If there are a few of you I recommend getting in early to avoid being split up.

Cabanas, yes. Like $200.