I was there yesterday for the first time. I found Diagon Alley to be much shadier than Hogsmeade. So if you have early park entry for Hogsmeade, do it first, and do Diagon Alley later when it's hotter. Also don't buy robes. My kids insisted on robes and then "got hot" when it hit over 90 degrees yesterday (duh). We did the same thing as you - checked into Royal Pacific at 3pm, our room was ready (yay!), did the pool, then City Walk the first night. Got up at 6am, carried bags to car, checked out on hotel TV, went via boat to Universal and was in the park by 7:40. The early admission time is SOOOO WORTH THE MONEY. To me it was as good as the express pass!