But if you don't plan and don't turn up early, you find yourself queuing a lot of the day, unable to find sunbeds, lockers, waiting ages for food and drink, queuing to get on the slides etc.
Whereas if you think and plan a little, you can avoid the worst of the crowds and have a much better experience that will often cost you less as reading the tips will teach you that it's a good idea to take drinks and snacks in so you don't have to queue to buy them at stupid prices, but to do this, you need to hide them at the bottom of your bag to get past the bag searchers.