What time is it advisable to arrive if they open at 10:30 a.m.?

The earlier the opening time the better this way you distribute the time to go up to all the attractions.

1pm is good

As early as possible if it is high season! Go to the most popular and then select the ones you want!

11 am! or soon as it opens. 4-5 is perfect if you want to skip security lines.

I arrive at 10 and everything is fine, if you want to avoid any type of line, arrive a little earlier

10am