Do you have to book in advance?

And

You have to buy your tickets in advance but I recommend that you ask well what is included, if you are also going to buy the packages that include food and express tickets to the games

Yes, but when you get to the park you have a delay

More than reservation, it is preferable to buy your tickets in advance so that your access is faster. Also if you buy tickets to the 3 parks of universal, it is supposed to have a lower cost.

There's no need. Where you stay you can get tickets to the parks

I went on June 3 and bought the tickets 1 day before

I went this weekend and bought them there ....

I bought the lockers here like 2 months before but I recommend that you do it in advance