Your best bet would be to call the park and ask... or just look at the operating hours for a good idea of what to expect.
When I was out there for Winter Coaster Soalce, I heard a few people saying that, the best way to get through USH, is to do everything in the lower part of the park 1st(Jurrasic Park, Mummy, etc.).
As for April 15th, that is Easter weekend. I'm sure to expect large crowds since that is during Spring Break for most Southern California schools.
...and such
Thanks in Advance
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