I did not need one.
Depends on the day. Most days, you do not need.
On busy days or weekends i would definitely make reservations. We went on a weekday and it wasn't crowded at all. I'm sure weekends or holidays its best to reserve online. When you do you just show them your code and its super easy.
In my experience you can make reservations to rent one of the canopy's but if you're just going to hit the beach it will be the regular entry fee per person. No reservations required
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