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Not for nothin' but the Wizarding World of Harry Potter at Universal Studios is the best ride/amusement park environment I have ever been on or seen. That section of the park could literally be expanded to an entire Theme Park full of NOTHING but Harry Potter related content. It really is that good. DiaGON Alley, Butterbeer, Honeydukes, Hogwarts, et al... It really is a place to fan out, geek out, just plain ol' enjoy yourself.
I assume you are talking about the one in LA, but the one is Florida is amazing too. I brought my daughter to it several times when she was younger and she loved the place. And I loved it too. I just wish I had the time to go there when it wasn't a 98 degree Florida summer.