Were only planning one day at Universal doing a park to park ticket. There's 4 of us- a 4 yr old, a 12 yr and 2 adults. Ideally we'll spend most of the time in Diagon Alley. I know the park will probably be crowded but just wondering if it's very crowded/unmanageable? Any tips to get through the day in the most efficient manner to get the most out of the day? I understand my 4 yr old probably wont be able to ride much but we've been promising my son a trip to Harry Potter land for awhile