Services like Klook have been real lifesavers for people like me, especially when I was in Seoul. I’m not exactly an obsessive planner but I’m definitely more of the type who likes to prepare in advance compared to the kind that does everything spontaneously.
The Disney California Adventure, though slightly smaller than the neighbouring Disneyland Park, boasts an impressive list of attractions and entertainment. Unless you have two full days at the California Adventure park and a great strategy to get around, you will not be able to get on all the rides and watch all the shows.
Universal Studios Japan (USJ) is one of the must-do places when you visit Osaka. And the biggest draw for me is definitely the Wizarding World of Harry Potter, the closest thing to living my Hogwarts dream.