Universal Studios' newly opened park is divided into four areas: Harry Potter, Mario, How to Train Your Dragon, and Dark Fantasy. Hotels staying at Universal Studios can enter the park early, but Express Passes require a separate ticket.
The Ministry of Magic in Harry Potter and the broken-track roller coaster in Mario are the most popular attractions; it's recommended to rush in at the top of the gates with an Express Pass.
The Ministry of Magic area is absolutely stunning, a 1:1 recreation of the scene. The smoke effects upon entering the Ministry of Magic, and the ride itself, are all worth making a special trip for.
The Mario area is similar to the one in Osaka; those who haven't ridden it should definitely experience it, while those who have can consider it after Harry Potter.
The Dark Fantasy and How to Train Your Dragon areas feature less mainstream IPs. The roller coaster in the How to Train Your Dragon area is worth trying, and the food in the park is more suited to Chinese tastes.
Overall, it's a very exciting park and worth spending a whole day exploring.